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Consolidated Statement of Shareholders Equity (Parenthetical) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2018
 [1]
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
 [1]
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Document Fiscal Year Focus             2018    
Common stock cash dividends (in dollars per share) $ 2.17 $ 1.01 $ 1.01 $ 1.95 $ 0.94 $ 0.94 $ 4.19 $ 3.83 $ 3.61
Stock option exercises and other, tax benefits             $ 0.0 $ 0.0 $ (0.6)
[1] Includes a $1.01 and $0.94 per share dividend declared and paid in third quarter of 2018 and 2017, respectively, and a $1.16 and $1.01 per share dividend declared in the third quarter and paid in fourth quarter of 2018 and 2017, respectively.