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Pension And Other Retiree Benefits (Net Periodic Benefit Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]        
Expected contributions to defined benefit plans for 2020 $ 19.4   $ 19.4  
Contributions by company to date     13.4  
Pension | United States        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.4 $ 0.3 1.2 $ 1.0
Interest cost 1.5 1.8 4.4 5.5
Expected return on plan assets (2.8) (2.9) (8.5) (8.7)
Amortization of net loss (gain) 0.8 0.6 2.4 1.6
Amortization of prior service cost 0.1 0.1 0.3 0.3
Net periodic benefit income(1) [1] 0.0 (0.1) (0.2) (0.3)
Pension | International        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.4 0.3 1.1 0.9
Interest cost 2.4 3.3 7.2 10.1
Expected return on plan assets (4.7) (5.1) (13.8) (15.4)
Amortization of net loss (gain) 1.3 0.9 3.7 2.6
Amortization of prior service cost 0.1 0.1 0.2 0.1
Net periodic benefit income(1) [1] (0.5) (0.5) (1.6) (1.7)
Post-retirement        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.0 0.1 0.1 0.2
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of net loss (gain) (0.1) (0.1) (0.4) (0.3)
Amortization of prior service cost 0.0 0.0 0.0 0.0
Net periodic benefit income(1) [1] $ (0.1) $ 0.0 $ (0.3) $ (0.1)
[1] The components, other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income.