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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net income $ 77.4 $ 57.9
Less: dividends declared (23.3) (23.1)
Undistributed earnings $ 54.1 $ 34.8
Percent allocated to common shareholders 99.70% 99.30%
Undistributed earnings available to common shareholders $ 53.9 $ 34.5
Add: dividends declared on common stock, restricted share units and vested and deferred restricted and performance shares 23.2 22.8
Income from continuing operations attributable to common shares $ 77.1 $ 57.3
Denominator (in thousands):    
Denominator for basic EPS: weighted-average common shares outstanding 57,547,000 61,684,000
Effect of dilutive securities:    
Performance awards (in shares) 73,000 131,000
Stock options (in shares) 250,000 349,000
Denominator for diluted EPS: adjusted weighted-average common shares outstanding and assumed conversion 57,870,000 62,164,000
Per share income from continuing operations attributable to common shares:    
Basic (in dollars per share) $ 1.34 $ 0.93
Diluted (in dollars per share) $ 1.33 $ 0.92
Basic weighted-average common shares outstanding 57,547,000 61,684,000
Basic weighted-average common shares outstanding, unvested restricted shares expected to vest and restricted share units 57,735,000 62,117,000
Percent allocated to common shareholders 99.70% 99.30%
Income (loss) from discontinued operations and net income    
Income from discontinued operations attributable to common shareholders for basic and diluted earnings per share $ 2.0 $ 250.0
Net income attributable to common shareholders for basic and diluted earnings per share $ 79.1 $ 307.3
Antidilutive stock options excluded from EPS calculation (in shares) 340,000 564,000