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Commitments and Contingencies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]        
Cash and cash equivalents $ 281.6 $ 47.1 $ 68.0 $ 70.5
Restricted cash and marketable securities 117.7 179.4 115.1 108.1
Less: restricted marketable securities (55.9) (49.1) (46.6) (45.3)
Cash, cash equivalents, restricted cash and restricted cash equivalents $ 343.4 $ 177.4 $ 136.5 $ 133.3