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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, 2016
Sep. 30, 2016
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
Numerator:                      
Income from continuing operations $ 76.5 $ (9.5) $ 115.3 $ 68.5 $ 81.7 $ 103.6 $ 94.8 $ 39.5 $ 250.8 $ 319.6 $ 251.7
Less: dividends declared - common stock outstanding, restricted shares and restricted share units                 (84.5) (72.3) (61.2)
Undistributed earnings                 $ 166.3 $ 247.3 $ 190.5
Percent allocated to common shareholders                 99.30% 99.30% 99.50%
Undistributed earnings allocated to common shareholders                 $ 165.0 $ 245.6 $ 189.5
Add: dividends declared - common stock                 83.6 71.4 60.4
Income from continuing operations attributable to common shares                 $ 248.6 $ 317.0 $ 249.9
Denominator (in thousands):                      
Denominator for basic EPS: weighted-average common shares outstanding                 64,226 64,844 64,170
Effect of dilutive securities:                      
Performance awards (in shares)                 257 253 362
Stock options (in shares)                 400 707 772
Denominator for diluted EPS: adjusted weighted-average common shares outstanding and assumed conversion                 64,883 65,804 65,304
Per share income from continuing operations:                      
Basic (in dollars per share) $ 1.18 $ (0.15) $ 1.78 $ 1.06 $ 1.25 $ 1.59 $ 1.45 $ 0.60 $ 3.87 $ 4.89 $ 3.89
Diluted (in dollars per share) $ 1.17 $ (0.15) $ 1.75 $ 1.05 $ 1.24 $ 1.56 $ 1.43 $ 0.59 $ 3.83 $ 4.82 $ 3.83
Basic weighted-average common shares outstanding                 64,226 64,844 64,170
Basic weighted-average common shares outstanding, unvested restricted shares expected to vest and restricted share units                 64,682 65,304 64,512
Percent allocated to common shareholders                 99.30% 99.30% 99.50%
Income (loss) from discontinued operations and net income                      
Income (loss) from discontinued operations attributable to common shareholders for basic and diluted earnings per share                 $ (0.7) $ 0.1 $ (0.4)
Net income attributable to common shareholders for basic and diluted earnings per share                 $ 248.0 $ 317.1 $ 249.5
Antidilutive stock options excluded from EPS calculation (in shares)                 23,100 257,500