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Fair Value of Financial Instruments (Schedule of Assets and Liabilities, Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] $ 41.3 $ 25.7
Restricted cash and cash equivalents [1] 417.9 303.6
Restricted securities available for sale [2] 62.0 58.6
Loans receivable, net [1] 6,229.5 5,855.1
Revolving secured line of credit [1] 0.0 171.9
Secured financing [1] 3,306.3 3,100.9
Senior notes [1] 965.1 556.3
Mortgage note [1] 11.7 11.9
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] 41.3 25.7
Restricted cash and cash equivalents [1] 417.9 303.6
Restricted securities available for sale [2] 49.6 47.9
Senior notes [1] 965.1 556.3
Mortgage note [1] 0.0 0.0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted securities available for sale [2] 12.4 10.7
Revolving secured line of credit [1] 0.0 171.9
Secured financing [1] 3,306.3 3,100.9
Mortgage note [1] 11.7 11.9
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable, net [1] $ 6,229.5 $ 5,855.1
[1] Measured at amortized cost with fair value disclosed.
[2] Measured at fair value on a recurring basis.