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Reinsurance (Reinsurance Financial Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reinsurance Disclosures [Abstract]      
Written premiums, Direct $ 9,531,050,000 $ 7,874,050,000 $ 7,386,759,000
Written premiums, Assumed 1,169,084,000 973,597,000 875,459,000
Written premiums, Ceded (1,837,267,000) (1,585,210,000) (1,398,719,000)
Total net premiums written 8,862,867,000 7,262,437,000 6,863,499,000
Earned premiums, Direct 8,825,568,000 7,489,470,000 7,141,427,000
Earned premiums, Assumed 1,085,804,000 941,321,000 820,705,000
Earned premiums, Ceded (1,805,341,000) (1,499,948,000) (1,328,844,000)
Net premiums earned 8,106,031,000 6,930,843,000 6,633,288,000
Ceded losses and loss expenses incurred 1,236,960,000 955,630,000 836,831,000
Ceded commission earned 449,739,000 358,253,000 314,191,000
Uncollectible reinsurance $ 7,712,903 $ 7,800,649 $ 690,127