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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Currency translation adjustments $ (92.7) $ (91.7)
Unrealized losses on defined benefit plans (3.4) (3.5)
Total $ (96.1) $ (95.2)