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Net Income (Loss) Per Common Share Net Income per Common Share - Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Attributable to Parent	$ 30.2	$ 2.9	$ 6.0	$ (38.8)
Earnings Per Share, Basic	$ 0.34	$ 0.03	$ 0.07	$ (0.45)
Earnings Per Share, Diluted	$ 0.34	$ 0.03	$ 0.07	$ (0.45)
Weighted Average Number of Shares Outstanding, Basic	88.2	86.4	87.7	85.8
Diluted weighted average shares outstanding	89.4	87.4	88.8	85.8
Effect of potentially dilutive stock options
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0.2	0.4	0.3	0.0
Effect of potentially dilutive share-based awards
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1.0	0.6	0.8	0.0

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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