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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Tax expense (benefit) on change in unrecognized net actuarial losses and prior service cost related to pension benefit plans $ (0.6) $ 1.3 $ (2.1)
Tax expense (benefit) on unrealized net gain on derivatives $ 0.1 $ 0.6 $ (0.1)