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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
[2]
Dec. 31, 2015
[2]
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 598.7 $ 370.6    
Restricted cash 21.3 30.5 [1]    
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 620.0 $ 401.1 $ 476.2 $ 396.8
[1] Amounts were changed to conform to the current-year presentation. See Note 11.
[2] Amounts were changed to conform to the current-year presentation. See Note 11.