Earnings Per Share (Details) - USD ($) $ / shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Income (Loss) from Continuing Operations Attributable to Parent	$ 38.2	$ 65.9
Less Undistributed Earnings (Loss) Allocated to Nonvested Stock	$ 0.0	$ 0.0
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ 38.2	$ 65.9
Denominator:
Weighted Average Number of Shares Outstanding, Basic	77,731,793	79,769,761
Effect of dilutive securities:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,162,161	667,772
Weighted average number of shares outstanding, assuming dilution of stock options and awards	78,893,954	80,437,533