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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]    
Accumulated pension and OPEB liability adjustments, net of income tax impact of $17.6 million and $21.9 million at December 31, 2016 and 2015, respectively $ (36.5) $ (35.6)
Accumulated unrealized loss on derivative instruments, net of income tax impact of $(3.0) million and $0.3 million at December 31, 2016 and 2015, respectively (1.9) (21.6)
Accumulated unrealized foreign currency translation adjustments (100.9) (84.2)
Accumulated other comprehensive loss (139.3) (141.4)
Accumulated pension and OPEB tax 17.6 21.9
Accumulated tax on gain (loss) on financial instruments $ (3.0) $ 0.3