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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 516.1 $ 733.9    
Restricted cash 17.8 30.2    
Total cash, cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows $ 533.9 $ 764.1 $ 620.0 $ 401.1