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Earnings Per Share - Reconciliation of Net Income (Loss) to Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Income from continuing operations	$ 7.2	$ 10.4
Gain from discontinued operations and disposal, net of tax	0.1	3.2
Net income	$ 7.3	$ 13.6
Weighted average shares outstanding - Basic (shares)	59.6	62.1
Dilutive effect of common stock equivalents (shares)	0.7	0.9
Weighted average shares outstanding - Diluted (shares)	60.3	63.0
Basic earnings per share:
Earnings from continuing operations (usd per share)	$ 0.12	$ 0.17
Gain from discontinued operations and disposal, net of tax (usd per share)	0.00	0.05
Net earnings per share (usd per share)	0.12	0.22
Diluted earnings per share:
Earnings from continuing operations (usd per share)	0.12	0.17
Gain from discontinued operations and disposal, net of tax (usd per share)	0.00	0.05
Net earnings per share (usd per share)	$ 0.12	$ 0.22

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