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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 150.3	$ (86.0)	$ (73.4)
Loss from discontinued operations	(0.5)	(2.1)	(2.0)
Net income (loss)	$ 149.8	$ (88.1)	$ (75.4)
Weighted average number of shares outstanding - basic	143.4	142.4	141.1
Dilutive effect of employee stock plans	1.7	0.0	0.0
Dilutive effect of stock warrants	0.2	0.0	0.0
Dilutive potential common shares	1.9	0	0
Adjusted weighted average shares	145.3	142.4	141.1
Earnings Per Share, Basic [Abstract]
Income (loss) from continuing operations	$ 1.05	$ (0.60)	$ (0.52)
Loss from discontinued operations	(0.01)	(0.02)	(0.01)
Net income (loss) per share - basic	1.04	(0.62)	(0.53)
Earnings Per Share, Diluted [Abstract]
Income (loss) from continuing operations	1.03	(0.60)	(0.52)
Loss from discontinued operations	0.00	(0.02)	(0.01)
Net income (loss) per share - diluted	$ 1.03	$ (0.62)	$ (0.53)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2.6	4.9	5.8

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

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