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Capital Stock - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 23, 2018
Jul. 31, 2018
Feb. 28, 2018
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Equity [Abstract]              
Treasury stock         42,080,250 42,080,250 14,935,926
Remaining shares available for repurchase         22,900,000 22,900,000  
Subsequent Event [Line Items]              
Incremental shares authorized     20,000,000 25,000,000      
Shares authorized for repurchase     30,100,000        
Shares repurchased           27,100,000  
Treasury stock repurchases (in usd)           $ 644.2  
Dividends (in usd per share)         $ 0.06    
Subsequent Event              
Subsequent Event [Line Items]              
Shares repurchased   2,800,000          
Treasury stock repurchases (in usd)   $ 65.6          
Treasury stock settled 2,700,000            
Dividends (in usd per share) $ 0.07