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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
 [2]
Dec. 31, 2015
 [2]
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 302.0 $ 370.6    
Restricted cash 33.5 30.5 [1]    
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 335.5 $ 401.1 $ 547.6 $ 396.8
[1] Changed to conform to the current-year presentation. See Note 11.
[2] Changed to conform to the current-year presentation. See Note 11.