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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Income (Loss) from Continuing Operations Attributable to Parent $ 53.5 $ 33.6 $ 174.2 $ 147.7
Less Undistributed Earnings (Loss) Allocated to Nonvested Stock $ 0.0 $ 0.0 $ 0.0 $ 0.0
Income (Loss) from Continuing Operations, Per Basic and Diluted Share $ 53,500,000 $ 33,600,000 $ 174,200,000 $ 147,700,000
Denominator:        
Weighted Average Number of Shares Outstanding, Basic 77,694,974 77,935,783 77,766,828 78,808,179
Effect of dilutive securities:        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 1,109,322 681,693 1,123,102 663,577
Weighted average number of shares outstanding, assuming dilution of stock options and awards 78,804,296 78,617,476 78,889,930 79,471,756
Basic earnings per share $ 0.69 $ 0.43 $ 2.24 $ 1.87
Diluted earnings per share $ 0.68 $ 0.43 $ 2.21 $ 1.86