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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (65.4) $ (91.7)
Unrealized losses on defined benefit plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total (4.0) (3.5)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (69.4) $ (95.2)