XML 82 R64.htm IDEA: XBRL DOCUMENT v3.8.0.1
Net Earnings Per Share - Calculation of Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Net earnings available to common shareholders $ 216.3 $ 137.7 $ 117.0 $ 74.4 $ 127.4 $ 129.2 $ 115.4 $ 71.7 $ 545.4 $ 443.7 $ 419.2
Weighted-average common shares outstanding (in millions):                      
Weighted-average common shares outstanding - basic (in shares)                 67.1 70.1 76.8
Weighted-average common shares outstanding - diluted (in shares)                 67.9 70.8 77.7
Net earnings per share - basic (in dollars per share) $ 3.26 $ 2.06 $ 1.74 $ 1.10 $ 1.89 $ 1.89 $ 1.61 $ 0.98 $ 8.13 $ 6.33 $ 5.46
Net earnings per share - diluted (in dollars per share) $ 3.22 $ 2.04 $ 1.72 $ 1.09 $ 1.87 $ 1.87 $ 1.60 $ 0.98 $ 8.04 $ 6.27 $ 5.40
Stock Options                      
Weighted-average common shares outstanding (in millions):                      
Effect of dilutive securities                 0.2 0.2 0.5
Non-Stock Option Awards                      
Weighted-average common shares outstanding (in millions):                      
Effect of dilutive securities                 0.6 0.5 0.4