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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Changes in cumulative translation adjustment, tax $ 1.1 $ (0.7) $ 1.0 $ (0.8)
Unrealized gains on derivative instruments, tax 0.0 0.1 (0.2) 0.0
Amortization of prior service credit, tax 0.0 0.0 0.1 0.1
Amortization of actuarial net losses, tax $ 0.0 $ (0.3) $ (0.1) $ (0.5)