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Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 24.7 $ 25.7 $ 195.7 $ 8.2
Restricted cash and cash equivalents 329.8 303.6 347.6 255.6
Total cash, cash equivalents, restricted cash and restricted cash equivalents $ 354.5 $ 329.3 $ 543.3 $ 263.8