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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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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 amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting 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 -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 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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