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Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 41.3 $ 25.7 $ 11.5 $ 8.2
Restricted cash and cash equivalents 417.9 303.6 368.5 255.6
Total cash, cash equivalents, restricted cash and restricted cash equivalents $ 459.2 $ 329.3 $ 380.0 $ 263.8