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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Net Income (Loss) Attributable to Parent $ 64.2 $ 71.6 $ 248.6 $ 242.8
Less Undistributed Earnings (Loss) Allocated to Nonvested Stock $ 0.0 $ 0.0 $ 0.0 $ 0.0
Denominator:        
Weighted Average Number of Shares Outstanding, Basic 75,628,410 76,903,395 75,864,544 77,332,209
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 964,284 1,524,710 1,037,882 1,313,294
Weighted average number of shares outstanding, assuming dilution of stock options and awards 76,592,694 78,428,105 76,902,426 78,645,503
Basic earnings per share $ 0.85 $ 0.93 $ 3.28 $ 3.14
Diluted earnings per share $ 0.84 $ 0.91 $ 3.23 $ 3.09