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Debt Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Debt facility financing amount $ 2,924.2 $ 2,622.1
Deferred Debt Issuance Costs (17.4) (16.8)
Unamortized debt discount (1.5) (1.6)
Carrying Amount 2,905.3 2,603.7
Revolving Secured Line of Credit [Member]    
Debt Instrument [Line Items]    
Debt facility financing amount [1] 134.1  
Deferred Debt Issuance Costs [1] 0.0  
Unamortized debt discount [1] 0.0  
Carrying Amount [1] 134.1  
Secured financings [Member]    
Debt Instrument [Line Items]    
Debt facility financing amount [2] 2,240.1 2,072.1
Deferred Debt Issuance Costs [2] (10.6) (9.7)
Unamortized debt discount [2] 0.0 0.0
Carrying Amount [2] 2,229.5 2,062.4
Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt facility financing amount 550.0 550.0
Deferred Debt Issuance Costs (6.8) (7.1)
Unamortized debt discount (1.5) (1.6)
Carrying Amount $ 541.7 $ 541.3
[1] Excludes deferred debt issuance costs of $2.1 million and $2.4 million as of March 31, 2017 and December 31, 2016, respectively, which are included in other assets.
[2] Warehouse facilities and asset-backed secured financings ("Term ABS").