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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Changes in cumulative translation adjustment, tax $ 2.7 $ (3.3) $ 1.5
Unrealized gains on derivative instruments, tax (0.1) (0.2) (0.1)
Amortization of prior service credit, tax 0.2 0.2 0.2
Amortization of actuarial net losses, tax (0.3) (0.9) (0.5)
Actuarial net gains, tax $ 3.3 $ (8.8) $ (0.8)