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Financing (Long-Term Debt Repayments) (Narrative) (Details)
$ / shares in Units, € in Millions, $ in Millions
1 Months Ended 12 Months Ended
Oct. 24, 2019
USD ($)
$ / shares
Jul. 08, 2019
EUR (€)
Sep. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]            
Payments of debt extinguishment costs $ 7.0     $ 6.5 $ 0.0 $ 0.0
Payments of debt extinguishment costs, after-tax $ 5.0          
Payments of debt extinguishment costs, per diluted share | $ / shares $ 0.01          
Senior notes | 2.4% senior unsecured notes due 2020            
Debt Instrument [Line Items]            
Repayments of debt $ 500.0          
Interest rate of debt instrument 2.40%     2.40%    
Senior notes | 5.0% senior unsecured notes due 2020            
Debt Instrument [Line Items]            
Repayments of debt $ 375.0          
Interest rate of debt instrument 5.00%          
Senior notes | 1.0% senior unsecured notes due 2019            
Debt Instrument [Line Items]            
Repayments of debt | €   € 600        
Interest rate of debt instrument       1.00%    
Senior notes | 1.65% senior unsecured notes due 2018            
Debt Instrument [Line Items]            
Repayments of debt     $ 500.0