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Nonoperating Income (Expense) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Oct. 24, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other nonoperating income, net pension and postretirement benefits     $ 12.0 $ 35.0 $ 31.0
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 $ 0.01        
Proceeds from sales of investments     $ 0.0 22.2 137.9
Receivable from sale of marketable securities         22.0
Marketable securities, realized gain         73.0
Marketable securities, after tax realized gain         $ 46.0
Marketable securities, after-tax gain, per diluted share         $ 0.06
Senior notes | Redeemed notes          
Repayments of debt   $ 882.0      
Senior notes | 2.4% senior unsecured notes due 2020          
Repayments of debt $ 500.0        
Interest rate of debt instrument 2.40% 2.40% 2.40%    
Senior notes | 5.0% senior unsecured notes due 2020          
Repayments of debt $ 375.0        
Interest rate of debt instrument 5.00%        
Pension benefit plans | Non-U.S. plan          
Settlement loss     $ (7.0) $ 3.6  
Settlement loss, net of tax     $ (6.0)    
Settlement loss, per diluted share     $ (0.01)