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Subsequent Events (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Jul. 27, 2018
Jul. 26, 2018
Subsequent Event [Line Items]      
Shares repurchased (in shares) 5,344,411    
Average share price (in dollars per share) $ 78.40    
Aggregate purchase price $ 419,000,000    
Subsequent Event      
Subsequent Event [Line Items]      
Increase to the share repurchase program     $ 250,000,000
Total authorization of share repurchase program     $ 750,000,000
Common shares outstanding (in shares)   19,587,748