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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]        
Level of risk retained by our captive insurance company (per claim) $ 2.5      
Loss Contingency, Receivable 37.7 $ 40.6    
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount 9,700.0 8,400.0    
Loan loss accrual 20.6 17.5    
Insurance Claims [Member]        
Loss Contingencies [Line Items]        
Loss Contingency Accrual, Provision 0.1 3.5 $ 21.0  
Loss Contingency Accrual, Provision Adjustment (2.9) (20.5) (1.4)  
Loss Contingency Accrual, Payments (2.2) (7.6) (3.0)  
Loss Contingency Accrual $ 38.1 $ 43.1 $ 26.7 $ 7.3