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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:        
Income from continuing operations $ 75.4 $ 153.0 $ 137.2 $ 230.4
Less: dividends declared (27.7) (22.9) (56.0) (46.2)
Undistributed earnings $ 47.7 $ 130.1 $ 81.2 $ 184.2
Percent allocated to common shareholders 99.70% 99.70% 99.70% 99.70%
Undistributed earnings available to common shareholders $ 47.6 $ 129.7 $ 81.0 $ 183.6
Add: dividends declared on common stock, restricted share units and vested and deferred restricted and performance shares 27.7 22.9 55.9 46.1
Income from continuing operations attributable to common shares $ 75.3 $ 152.6 $ 136.9 $ 229.7
Denominator (in thousands):        
Basic weighted-average shares outstanding (in shares) 54,800,000 57,000,000.0 55,300,000 57,200,000
Effect of dilutive securities:        
Performance awards (in shares) 200,000 200,000 200,000 200,000
Stock options (in shares) 200,000 400,000 300,000 300,000
Denominator for diluted EPS: weighted-average shares outstanding (in shares) 55,200,000 57,600,000 55,800,000 57,700,000
Per share income from continuing operations attributable to common shares:        
Basic (in dollars per share) $ 1.37 $ 2.68 $ 2.47 $ 4.01
Diluted (in dollars per share) $ 1.36 $ 2.65 $ 2.45 $ 3.98
Basic weighted-average common shares outstanding (in shares) 54,800,000 57,000,000.0 55,300,000 57,200,000
Basic weighted-average shares outstanding and unvested restricted shares expected to vest (in shares) 55,000,000.0 57,100,000 55,500,000 57,400,000
Percent allocated to common shareholders 99.70% 99.70% 99.70% 99.70%
Income (loss) from discontinued operations and net income        
Income from discontinued operations attributable to common shareholders for basic and diluted earnings per share $ 0.0 $ (0.1) $ 0.0 $ 1.9
Net income attributable to common shareholders for basic and diluted earnings per share $ 75.3 $ 152.5 $ 136.9 $ 231.6
Antidilutive stock options excluded from EPS calculation (in shares) 500,000 0 300,000 400,000