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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]        
Level of risk retained by our captive insurance company (per claim) $ 2.5      
Loss Contingency, Receivable 44.0 $ 37.7    
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount 12,200.0 9,700.0    
Loan loss accrual 22.1 20.6    
Insurance Claims [Member]        
Loss Contingencies [Line Items]        
Loss Contingency Accrual, Provision 6.7 0.1 $ 3.5  
Loss Contingency Accrual, Provision Adjustment 3.8 (2.9) 20.5  
Loss Contingency Accrual, Payments (0.4) (2.2) (7.6)  
Loss Contingency Accrual $ 48.2 $ 38.1 $ 43.1 $ 26.7