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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Income from continuing operations $ 94.8 $ 75.7 $ 134.3 $ 112.1
Less: dividends declared - common stock outstanding, unvested restricted shares and restricted share units (16.4) (14.6) (33.1) (28.8)
Undistributed earnings $ 78.4 $ 61.1 $ 101.2 $ 83.3
Percent allocated to common shareholders 99.50% 99.50% 99.50% 99.50%
Undistributed earnings allocated to common shareholders $ 78.0 $ 60.8 $ 100.7 $ 82.9
Add: dividends declared - common stock 16.3 14.1 32.5 28.2
Numerator for basic and diluted EPS $ 94.3 $ 74.9 $ 133.2 $ 111.1
Denominator (in thousands):        
Denominator for basic EPS: weighted-average common shares outstanding 65,010 64,100 64,943 63,990
Effect of dilutive securities:        
Performance awards (in shares) 342 364 342 364
Stock options (in shares) 666 977 648 975
Denominator for diluted EPS: adjusted weighted-average common shares outstanding and assumed conversion 66,018 65,441 65,933 65,329
Per share income from continuing operations:        
Basic (in dollars per share) $ 1.45 $ 1.17 $ 2.05 $ 1.73
Diluted (in dollars per share) $ 1.43 $ 1.15 $ 2.02 $ 1.70
Basic weighted-average common shares outstanding 65,010 64,100 64,943 63,990
Basic weighted-average common shares outstanding, unvested restricted shares expected to vest and restricted share units 65,344 64,444 65,276 64,333
Percent allocated to common shareholders 99.50% 99.50% 99.50% 99.50%
Loss from discontinued operations and net income        
Income (loss) from discontinued operations attributable to common shareholders for basic and diluted earnings per share $ 0.1 $ (0.5)   $ (1.1)
Net income attributable to common shareholders for basic and diluted earnings per share $ 94.4 $ 74.4 $ 133.2 $ 110.0