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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]        
Level of risk retained by our captive insurance company (per claim) $ 2.5      
Loss Contingency, Receivable 22.0 $ 1.3    
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount 8,000.0      
Loan loss accrual 16.0 12.2    
Insurance Claims [Member]        
Loss Contingencies [Line Items]        
Loss Contingency Accrual, Provision 21.0 8.0 $ 2.9  
Loss Contingency Accrual, Provision Adjustment 1.4 0.0 7.8  
Loss Contingency Accrual, Payments (3.0) (19.9) (0.7)  
Loss Contingency Accrual $ 26.7 $ 7.3 $ 19.2 $ 9.2