v3.5.0.2
Stock Repurchases, Dividends and Earnings per Share - Share Repurchase Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Equity [Abstract]        
Number of shares repurchased (in shares) 2.2 2.3 6.5 7.3
Amount paid $ 110.5 $ 93.8 $ 306.6 $ 293.3
Weighted average cost per share (in dollars per share) $ 50.75 $ 40.89 $ 47.83 $ 40.66