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Pension and Other Retiree Benefits (Net Periodic Benefit Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1.3 $ 1.6 $ 1.4
Interest cost 7.4 6.7 7.1
Expected return on plan assets (11.7) (11.8) (12.3)
Amortization of net loss (gain) 2.2 2.7 2.0
Amortization of prior service cost 0.4 0.4 0.4
Curtailment gain 0.0 0.0 0.0
Settlement loss 0.0 0.0 0.0
Net periodic benefit income(1) [1] (0.4) (0.4) (1.4)
Pension | International      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1.3 1.9 1.9
Interest cost 13.4 12.9 13.4
Expected return on plan assets (20.5) (22.7) (21.8)
Amortization of net loss (gain) 3.3 3.4 3.0
Amortization of prior service cost 0.3 0.0 0.0
Curtailment gain 0.0 (0.6) 0.0
Settlement loss 0.1 0.0 0.0
Net periodic benefit income(1) [1] (2.1) (5.1) (3.5)
Post-retirement      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.1 0.0
Interest cost 0.2 0.2 0.2
Expected return on plan assets 0.0 0.0 0.0
Amortization of net loss (gain) (0.4) (0.4) (0.4)
Amortization of prior service cost 0.0 (0.1) 0.0
Curtailment gain 0.0 0.0 0.0
Settlement loss 0.0 0.0 0.0
Net periodic benefit income(1) [1] $ (0.2) $ (0.2) $ (0.2)
[1]
(1)
The components, other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income.