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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 55.0	$ 10.3
Weighted average common shares outstanding - basic	144.2	142.9
Dilutive effect of stock warrants	0.0	0.3
Dilutive effect of employee stock plans	1.7	2.0
Dilutive potential common shares	1.7	2.3
Weighted average shares outstanding - diluted	145.9	145.2
Net income per share of common stock:
Net income per share - basic	$ 0.38	$ 0.07
Net income per share - diluted	$ 0.38	$ 0.07

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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 call options and warrants using the treasury stock method.

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