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Pension and Other Retiree Benefits (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
yr
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of post-retirement plans not frozen to new participants 1    
Pension and post-retirement benefit obligations $ 283.2 $ 257.2  
Employer contributions 20.0    
Expected contributions to defined benefit plans for 2020 20.0    
Costs related to defined contribution plans $ 12.4 13.3 $ 13.4
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Payment of retirement benefits, commencement age for participants | yr 60    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Payment of retirement benefits, commencement age for participants | yr 65    
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 891.3 806.1  
Pension Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Pension and post-retirement benefit obligations 53.6 47.2  
Employer contributions $ 5.6 $ 5.7  
Pension Plan | U.S. | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 56.50%    
Pension Plan | U.S. | Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 33.50%    
Pension Plan | U.S. | Alternate assets      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 10.00%