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Acquisitions - Pro Forma Information (Details) (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]  
Pro forma revenues | $ $ 775
Pro forma net income | $ $ 308
Earnings Per Share, Pro Forma [Abstract]  
Basic | $ / shares $ 2.28
Diluted | $ / shares $ 2.27