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Pension and Other Retiree Benefits (Other Changes Recognized in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) $ 10.6 $ 15.0 $ 12.0
Amortization of actuarial (loss) gain (3.2) (2.2) (2.7)
Current year prior service cost 0.0 0.0 0.0
Amortization of prior service (cost) credit (0.4) (0.4) (0.4)
Foreign exchange rate changes 0.0 0.0 0.0
Total recognized in other comprehensive income (loss) 7.0 12.4 8.9
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) 6.7 12.0 8.5
Pension | International      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) 36.5 43.3 5.3
Amortization of actuarial (loss) gain (5.3) (3.3) (3.4)
Current year prior service cost 0.0 0.0 6.5
Amortization of prior service (cost) credit (0.3) (0.3) 0.3
Foreign exchange rate changes 8.5 3.4 (7.1)
Total recognized in other comprehensive income (loss) 39.4 43.1 1.6
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) 37.6 41.0 (3.5)
Post-retirement      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) 0.0 (1.0) (0.3)
Amortization of actuarial (loss) gain 0.5 0.4 0.4
Current year prior service cost 0.0 0.0 0.0
Amortization of prior service (cost) credit 0.0 0.0 0.1
Foreign exchange rate changes 0.0 0.0 0.1
Total recognized in other comprehensive income (loss) 0.5 (0.6) 0.3
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) $ 0.1 $ (0.8) $ 0.1