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Consolidated Statement of Shareholders Equity (Parenthetical) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2016
 [1]
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Common stock cash dividends (in dollars per share) $ 1.83 $ 0.89 $ 0.89 $ 0.89 $ 0.85 $ 0.85 $ 0.85 $ 3.61 $ 3.44 $ 3.28
Stock option exercises and other, tax benefits               $ (0.6) $ (44.8) $ (70.2)
[1] Includes an $0.89 per share dividend declared and paid in third quarter, and a $0.94 per share dividend declared in third quarter and paid in fourth quarter.