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Accumulated Other Comprehensive Income - Net Changes in Components of AOCI, Including Tax Effect (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Unrealized translation $ 17.1 $ (8.3) $ (22.1)
Defined benefit pension plans 0.6 0.7 (1.9)
Tax effect (0.1) (0.1) 0.6
Defined benefit pension plans, net of tax 0.5 0.6 (1.3)
Cash flow hedges 1.5 1.0 (1.0)
Tax effect (0.3) (0.2) 0.3
Cash flow hedges, net of tax 1.2 0.8 (0.7)
Total Other Comprehensive Income (Loss), Net of Tax $ 18.8 $ (6.9) $ (24.1)