• $101.1 million of net favorable development associated with Typhoons Jebi, Mangkhut and Trami, Hurricane Florence, the wildfires in California during the third and fourth quarters of 2018, Hurricane Michael and certain losses associated with aggregate loss contracts (collectively, the “2018 Large Loss Events”); and • $49.1 million of net favorable development associated with Hurricanes Harvey, Irma and Maria, the Mexico City Earthquake, the wildfires in California during the fourth quarter of 2017 and certain losses associated with aggregate loss contracts (collectively, the “2017 Large Loss Events”). The Company’s Property segment also experienced net favorable development of $34.8 million associated with a number of other small catastrophe events as well as attritional loss movements related to lines of business where the Company principally estimates net claims and claim expenses using traditional actuarial methods. Partially offsetting these net favorable developments was net adverse development of $5.5 million related to actuarial assumption changes. Year ended December 31, 2020 (Favorable) adverse development Catastrophe net claims and claim expenses Large catastrophe events 2019 Large Loss Events $ (44,389) 2018 Large Loss Events (43,991) 2017 Large Loss Events (32,649) Other 124 Total large catastrophe events (120,905) Small catastrophe events and attritional loss movements Other small catastrophe events and attritional loss movements (41,589) Total small catastrophe events and attritional loss movements (41,589) Total catastrophe and attritional net claims and claim expenses (162,494) Actuarial assumption changes 5,445 Total net (favorable) adverse development of prior accident years net claims and claim expenses $ (157,049) The net favorable development of prior accident years net claims and claim expenses within the Company’s Property segment in 2020 of $157.0 million was primarily comprised of net favorable development on prior year accident years net claims and claim expenses associated with the following large catastrophe events: • $44.4 million a ssociated with the 2019 Large Loss Events; • $44.0 million associated with the 2018 Large Loss Events; and • $32.6 million associated with the 2017 Large Loss Events. The Company’s Property segment also experienced net favorable development of $41.6 million associated with a number of other small catastrophe events as well as attritional loss movements related to lines of business where the Company principally estimates net claims and claim expenses using traditional actuarial methods. Partially offsetting these net favorable developments was net adverse development of $5.4 million related to actuarial assumption changes. F-52