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Losses, Claims and Settlement Expenses - Consolidated (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplementary Insurance Information, by Segment        
Losses, claims, and settlement expenses $ 11,425.5 $ 10,671.0 $ 9,929.5 $ 9,471.2
Liability for Unpaid Claims and Claims Adjustment Expense, Net   7,020.4 6,679.7 6,464.9
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year 2,610.4 2,557.8 2,577.6  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years (210.6) (83.8) (30.9)  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 2,399.7 2,474.0 2,546.6  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 810.9 795.5 851.5  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 1,309.0 1,337.7 1,480.2  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, excluding the reclassification of Consumer Credit Indemnity coverage 2,120.0 2,133.2 2,331.7  
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable $ 7,300.2 $ 7,020.4 $ 6,679.7  
One year development of consolidated reserves 3.00% 1.30% 0.50%  
Three year average annual development of consolidated reserves 1.60%      
General Insurance Segment [Member]        
Supplementary Insurance Information, by Segment        
Liability for Unpaid Claims and Claims Adjustment Expense, Net   $ 6,328.0 $ 6,021.3 5,766.1
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year $ 2,418.3 2,380.5 2,422.7  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years (137.9) (27.4) 14.5  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 781.5 783.2 835.4  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 1,239.8 1,263.1 1,346.6  
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable 6,587.0 6,328.0 6,021.3  
RFIG Run-off [Member]        
Supplementary Insurance Information, by Segment        
Liability for Unpaid Claims and Claims Adjustment Expense, Net   127.6 118.9 154.5
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year 19.3 48.8 41.1  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years (21.1) (11.9) (9.4)  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 0.2 1.1 3.3  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 14.3 27.0 64.0  
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable 111.2 127.6 118.9  
Title Insurance Group [Member]        
Supplementary Insurance Information, by Segment        
Liability for Unpaid Claims and Claims Adjustment Expense, Net   556.1 530.9 533.4
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year 160.6 117.2 99.5  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years (47.6) (41.8) (32.1)  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 21.4 4.6 3.6  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 53.4 45.4 66.2  
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable 594.2 556.1 530.9  
Corporate & Other [Member]        
Supplementary Insurance Information, by Segment        
Liability for Unpaid Claims and Claims Adjustment Expense, Net   8.6 8.4 10.8
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year 12.0 11.2 14.1  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years (3.9) (2.5) (3.9)  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 7.7 6.4 9.1  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 1.3 2.0 3.3  
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable 7.6 8.6 8.4  
Reinsurance Recoverable [Member]        
Supplementary Insurance Information, by Segment        
Reinsurance Recoverables $ 4,125.3 $ 3,650.5 $ 3,249.7 $ 3,006.3