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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:        
Income from continuing operations $ 153.0 $ 114.7 $ 230.4 $ 172.6
Less: dividends declared (22.9) (22.5) (46.2) (45.6)
Undistributed earnings $ 130.1 $ 92.2 $ 184.2 $ 127.0
Percent allocated to common shareholders 99.70% 99.30% 99.70% 99.40%
Undistributed earnings available to common shareholders $ 129.7 $ 91.6 $ 183.6 $ 126.2
Add: dividends declared on common stock, restricted share units and vested and deferred restricted and performance shares 22.9 22.4 46.1 45.2
Income from continuing operations attributable to common shares $ 152.6 $ 114.0 $ 229.7 $ 171.4
Denominator (in thousands):        
Denominator for basic EPS: weighted-average common shares outstanding 56,960,000 60,641,000 57,246,000 61,159,000
Effect of dilutive securities:        
Performance awards (in shares) 192,000 103,000 172,000 103,000
Stock options (in shares) 414,000 315,000 312,000 331,000
Denominator for diluted EPS: weighted-average shares outstanding 57,566,000 61,059,000 57,730,000 61,593,000
Per share income from continuing operations attributable to common shares:        
Basic (in dollars per share) $ 2.68 $ 1.88 $ 4.01 $ 2.80
Diluted (in dollars per share) $ 2.65 $ 1.87 $ 3.98 $ 2.78
Basic weighted-average common shares outstanding 56,960,000 60,641,000 57,246,000 61,159,000
Basic weighted-average shares outstanding and unvested restricted shares expected to vest 57,145,000 61,038,000 57,431,000 61,556,000
Percent allocated to common shareholders 99.70% 99.30% 99.70% 99.40%
Income (loss) from discontinued operations and net income        
(Loss) income from discontinued operations attributable to common shareholders for basic and diluted earnings per share $ (0.1) $ (0.9) $ 1.9 $ 249.1
Net income attributable to common shareholders for basic and diluted earnings per share $ 152.5 $ 113.0 $ 231.6 $ 420.4
Antidilutive stock options excluded from EPS calculation (in shares) 2,000 711,000 358,000 644,000