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Pension Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]        
Expense for all defined benefit and defined contributions pension plans   $ 177.0 $ 177.0 $ 154.0
NAV per share, investment redemption, notice period   90 days    
Pension Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Unrecognized prior service credits, before tax   $ 2.0    
Unrecognized net prior service credits, net of tax   2.0    
Unrecognized actuarial losses, before tax   (902.0)    
Unrecognized actuarial losses, net of tax   (572.0)    
Future amortization of prior service cost (credit)   (0.4)    
Future amortization of prior service cost (credit), net of tax   (0.2)    
Future amortization of gain (loss)   (37.0)    
Future amortization of gain (loss), net of tax   $ (24.0)    
Foreign Plan | Pension Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   3.90% 4.10%  
Employer contributions   $ 44.7 $ 43.5  
Expected employer contributions within the next year   $ 50.0    
Foreign Plan | Pension Benefit Plans | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   1.00% 1.10%  
Foreign Plan | Pension Benefit Plans | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   5.80% 5.80%  
Foreign Plan | Pension Benefit Plans | Weighted average        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   3.90% 4.10%  
United States | Domestic Plan | Pension Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   7.00% 7.00% 7.50%
Employer contributions   $ 53.2 $ 57.7  
Expected employer contributions within the next year   $ 30.0    
United States | Domestic Plan | Pension Benefit Plans | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   60.00%    
United States | Domestic Plan | Pension Benefit Plans | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   70.00%    
Scenario, forecast | United States | Domestic Plan | Pension Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions 7.00%