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Schedule 3 - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Earned Premiums $ 5,253.7 $ 4,672.2 $ 4,472.4
Other Income 4.8 94.6 35.5
Net Investment Income 427.3 348.2 364.3
Insurance Claims and Policy- holders’ Benefits 4,600.8 3,323.6 3,188.3
Amortization of Deferred Policy Acquisition Costs 684.3 641.8 408.3
Other Insurance Expenses 533.8 458.7 611.4
Deferred Policy Acquisition Costs 677.6 589.3  
Insurance Reserves 6,313.6 5,510.0  
Unearned Premiums 1,898.7 1,615.1  
Specialty Property & Casualty Insurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Earned Premiums 3,948.5 3,335.3 3,078.4
Premiums Written 4,057.3 3,435.5 3,211.3
Other Income 4.1 1.8 7.0
Net Investment Income 152.5 114.1 107.5
Insurance Claims and Policy- holders’ Benefits 3,593.7 2,378.4 2,278.9
Amortization of Deferred Policy Acquisition Costs 546.7 497.5 224.9
Other Insurance Expenses 227.8 154.4 330.7
Deferred Policy Acquisition Costs 219.0 177.4  
Insurance Reserves 2,319.7 1,544.8  
Unearned Premiums 1,545.9 1,262.9  
Preferred Property & Casualty Insurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Earned Premiums 651.7 688.2 750.3
Premiums Written 642.0 653.0 739.3
Other Income 0.0 0.1 0.0
Net Investment Income 68.6 37.7 44.1
Insurance Claims and Policy- holders’ Benefits 537.4 503.1 508.8
Amortization of Deferred Policy Acquisition Costs 103.8 111.2 120.1
Other Insurance Expenses 102.6 109.9 113.2
Deferred Policy Acquisition Costs 49.2 51.2  
Insurance Reserves 433.2 411.6  
Unearned Premiums 331.6 329.2  
Life & Health Insurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Earned Premiums 653.5 648.7 643.7
Other Income (1.3) 0.6 8.5
Net Investment Income 202.7 198.8 206.4
Insurance Claims and Policy- holders’ Benefits 469.7 442.0 402.7
Amortization of Deferred Policy Acquisition Costs 33.8 33.1 63.3
Other Insurance Expenses 325.1 301.8 270.7
Deferred Policy Acquisition Costs 409.4 360.7  
Insurance Reserves 3,544.5 3,532.1  
Unearned Premiums 21.2 23.0  
Other      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Earned Premiums 0.0 0.0 0.0
Other Income 2.0 92.1 20.0
Net Investment Income 3.5 (2.4) 6.3
Insurance Claims and Policy- holders’ Benefits 0.0 0.1 (2.1)
Amortization of Deferred Policy Acquisition Costs 0.0 0.0 0.0
Other Insurance Expenses (121.7) (107.4) $ (103.2)
Deferred Policy Acquisition Costs 0.0 0.0  
Insurance Reserves 16.2 21.5  
Unearned Premiums $ 0.0 $ 0.0