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Other Comprehensive Income - Components of Accumulated Comprehensive Income (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $17.4 million and $17.6 million at March 31, 2017 and December 31, 2016, respectively $ (35.4) $ (36.5)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.6 million and $3.0 million at March 31, 2017 and December 31, 2016, respectively (0.6) (1.9)
Accumulated unrealized foreign currency translation adjustments (95.0) (100.9)
Accumulated other comprehensive loss (131.0) (139.3)
Accumulated pension and OPEB tax 17.4 17.6
Accumulated tax on gain (loss) on financial instruments $ 2.6 $ 3.0