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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 507.2 $ 605.0    
Restricted cash 10.3 19.1    
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 517.5 $ 624.1 $ 601.1 $ 764.1