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Stock Repurchases, Dividends and Earnings per Share - Share Repurchase Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Equity [Abstract]    
Number of shares repurchased (in shares) 1.2 1.5
Amount paid $ 98.8 $ 111.5
Weighted average cost per share (in dollars per share) $ 85.06 $ 74.76