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Consolidated Statement of Shareholders Equity (Parenthetical) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
 [1]
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Common stock cash dividends (in dollars per share) $ 0.89 $ 0.85 $ 0.85 $ 0.85 $ 1.66 $ 0.81 $ 0.81 $ 3.44 $ 3.28 $ 3.12
Stock option exercises and other, tax benefits               $ (44.8) $ (70.2) $ (93.6)
[1] Includes a $0.81 per share dividend declared and paid in third quarter and a $0.85 per share dividend declared in third quarter and paid in fourth quarter.