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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 108.5 $ 94.0 $ 61.6
Other comprehensive income (loss):      
Change in foreign currency translation adjustment 1.8 (6.4) 10.5
Change in unrecognized net actuarial loss and prior service cost related to pension benefit plans, net of income tax expense (benefit) of $1.9, $(0.6) and $1.3, respectively 7.1 (3.7) 3.6
Change in unrealized net gain on derivatives, net of income tax (benefit) expense of $(0.3), $0.1 and $0.6, respectively (0.7) 0.3 1.0
Total other comprehensive income (loss) 8.2 (9.8) 15.1
Comprehensive income $ 116.7 $ 84.2 $ 76.7