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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 83.8 $ 85.8 $ 94.5
Other comprehensive income (loss), net of tax:      
Foreign currency translation adjustments 16.6 1.8 (28.6)
Less: Reclassification adjustment for realized translation adjustments (0.1) (0.9) (0.8)
Unrealized (loss) gain on derivative instruments (11.6) 1.6 2.4
Less: Reclassification adjustment for loss (gain) on derivative instruments included in net income 2.0 (4.5) (3.7)
Net (loss) gain from postretirement benefit plans (0.1) 0.6 (3.3)
Less: Amortization of postretirement benefit plans' costs included in net periodic benefit cost 3.9 3.3 3.8
Other comprehensive income (loss) 10.7 1.9 (30.2)
Comprehensive income $ 94.5 $ 87.7 $ 64.3