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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 17.5 $ 12.9
Other comprehensive (loss) income:    
Change in foreign currency translation adjustment 0.0 2.0
Change in unrecognized net actuarial loss and prior service cost related to pension benefit plans, net of income tax expense of $0.2 and $0.2, respectively 0.2 0.1
Change in unrealized gain on derivatives, net of income tax (benefit) expense of ($0.2) and $0.2, respectively (0.5) 0.8
Total other comprehensive (loss) income (0.3) 2.9
Comprehensive income $ 17.2 $ 15.8