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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Income from continuing operations $ 89.1 $ 96.9 $ 114.7 $ 57.9 $ 108.9 $ 79.1 $ 94.7 $ 57.9 $ 358.6 $ 340.6 $ 231.1
Less: dividends declared                 (93.5) (92.1) (84.5)
Undistributed earnings                 265.1 248.5 146.6
Undistributed earnings allocated to common shareholders                 264.3 246.8 145.6
Add: dividends declared to common shares, restricted share units and vested and deferred restricted and performance shares                 93.1 90.9 83.6
Income from continuing operations attributable to common shareholders                 $ 357.4 $ 337.7 $ 229.2
Shares (in thousands):                      
Basic weighted-average shares outstanding (in thousands) (in shares)                 60,393 63,073 64,226
Effect of dilutive securities:                      
Performance awards (in shares)                 83 137 257
Stock options (in shares)                 310 341 400
Diluted weighted-average shares outstanding (in shares)                 60,786 63,551 64,883
Per share income from continuing operations attributable to common shares:                      
Basic (in dollars per share) $ 1.50 $ 1.61 $ 1.88 $ 0.93 $ 1.75 $ 1.27 $ 1.47 $ 0.89 $ 5.92 $ 5.36 $ 3.57
Diluted (in dollars per share) $ 1.49 $ 1.59 $ 1.87 $ 0.92 $ 1.73 $ 1.26 $ 1.46 $ 0.88 $ 5.88 $ 5.32 $ 3.53
Basic weighted-average shares outstanding (in thousands) (in shares)                 60,393 63,073 64,226
Basic weighted-average common shares outstanding, unvested restricted shares expected to vest and restricted share units (in thousands) (in shares)                 60,561 63,513 64,682
Percent allocated to common shareholders                 99.70% 99.30% 99.30%
Income (loss) from discontinued operations and net income                      
Income (loss) from discontinued operations attributable to common shareholders for basic and diluted earnings per share                 $ 251.8 $ 24.8 $ 18.8
Net income attributable to common shareholders for basic and diluted earnings per share                 $ 609.2 $ 362.4 $ 248.0
Antidilutive stock options excluded from EPS calculation (in shares)                 813,000 320,600 23,100