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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net income $ 9.1 $ 2.5
Other comprehensive income (loss), net of tax:    
Cumulative translation adjustments (5.4) 1.1
Net actuarial gain 0.3 0.0
Total other comprehensive income (loss), net of tax (5.1) 1.1
Total comprehensive income $ 4.0 $ 3.6