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Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Schedule Of Cash And Cash Equivalents [Roll Forward]        
Cash and cash equivalents $ 280.4 $ 325.0 $ 112.3 $ 97.9
Restricted cash included in other assets 1.5 5.4 4.6 1.0
Cash, cash equivalents and restricted cash, end of period $ 281.9 $ 330.4 $ 116.9 $ 98.9