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Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Principal Outstanding $ 4,258.5 $ 3,842.5
Unamortized Debt Issuance Costs (26.1) (20.5)
Unamortized Discount (1.1) (1.1)
Carrying Amount 4,231.3 3,820.9
Other Assets [Member]    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs (2.6) (2.9)
Revolving Secured Line of Credit [Member]    
Debt Instrument [Line Items]    
Principal Outstanding [1] 0.0 171.9
Unamortized Debt Issuance Costs [1] 0.0 0.0
Unamortized Discount [1] 0.0 0.0
Carrying Amount [1] 0.0 171.9
Secured financings [Member]    
Debt Instrument [Line Items]    
Principal Outstanding [2] 3,296.8 3,108.7
Unamortized Debt Issuance Costs [2] (16.3) (16.0)
Unamortized Discount [2] 0.0 0.0
Carrying Amount [2] 3,280.5 3,092.7
Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal Outstanding 950.0 550.0
Unamortized Debt Issuance Costs (9.8) (4.5)
Unamortized Discount (1.1) (1.1)
Carrying Amount 939.1 544.4
Mortgages [Member]    
Debt Instrument [Line Items]    
Principal Outstanding 11.7 11.9
Unamortized Debt Issuance Costs 0.0 0.0
Unamortized Discount 0.0 0.0
Carrying Amount $ 11.7 $ 11.9
[1] Excludes deferred debt issuance costs of $2.6 million and $2.9 million as of March 31, 2019 and December 31, 2018, respectively, which are included in other assets.
[2] Warehouse facilities and Term ABS.