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Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Unpaid losses and LAE at beginning of period $ 2,192.8 $ 2,207.9
Less reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 532.5 504.4
Net unpaid losses and LAE at beginning of period 1,660.3 1,703.5
Losses and LAE, net of reinsurance, incurred during the period related to:    
Current period 110.2 113.3
Prior periods (3.5) (22.2)
Total net losses and LAE incurred during the period 106.7 91.1
Deduct payments for losses and LAE, net of reinsurance, related to:    
Current period 6.9 7.4
Prior periods 95.4 96.6
Total net paid losses and LAE during the period 102.3 104.0
Ending unpaid losses and LAE, net of reinsurance 1,664.7 1,690.6
Reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 527.0 498.7
Unpaid losses and LAE at end of period 2,191.7 2,189.3
Impact of the LPT Agreement 2.4 2.5
Involuntary Assigned Risk Business [Member]    
Losses and LAE, net of reinsurance, incurred during the period related to:    
Prior periods (0.5) (0.2)
Voluntary Risk Business [Member]    
Losses and LAE, net of reinsurance, incurred during the period related to:    
Prior periods $ (3.0) $ (22.0)