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Pension Benefit Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]        
NAV per share, investment redemption, notice period   90 days    
Expense for all defined benefit and defined contributions pension plans   $ 203.0 $ 167.0 $ 159.0
Pension benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Unrecognized prior service credits, before tax   4.0    
Unrecognized net prior service credits, net of tax   4.0    
Unrecognized actuarial losses, before tax   (1,000.0)    
Unrecognized actuarial losses, net of tax   (789.0)    
Future amortization of prior service cost (credit)   0.2    
Future amortization of prior service cost (credit), net of tax   0.2    
Future amortization of gain (loss)   (46.0)    
Future amortization of gain (loss), net of tax   $ (36.0)    
Pension benefit plans | U.S. Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   7.00% 7.00% 7.00%
Employer contributions   $ 9.7 $ 54.7  
Expected employer contributions within the next year   95.0    
Curtailment and settlement (losses) gains recognized   $ 0.0 $ 0.0  
Pension benefit plans | U.S. Pension Benefits | Scenario, forecast        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions 7.00%      
Pension benefit plans | U.S. Pension Benefits | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   60.00%    
Pension benefit plans | U.S. Pension Benefits | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   70.00%    
Pension benefit plans | Non-U.S. plan        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   3.90% 4.00%  
Employer contributions   $ 43.5 $ 45.3  
Expected employer contributions within the next year   40.0    
Curtailment and settlement (losses) gains recognized   (7.0) $ 3.6  
Curtailment and settlement (losses) gains recognized, net of tax   $ (6.0)    
Curtailment and settlement (losses) gains recognized, per diluted share   $ 0.01    
Pension benefit plans | Non-U.S. plan | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   0.80% 1.00%  
Pension benefit plans | Non-U.S. plan | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   5.00% 5.00%  
Pension benefit plans | Non-U.S. plan | Weighted average        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   3.90% 4.00%