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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Tax effect on net change in pension asset/liability $ 6.2 $ 2.8 $ (2.9)
Net change in fair value of derivative instruments, tax $ (5.6) $ 4.0 $ (3.2)