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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |
Tax benefit | $ 5.3 | $ (121.5) | $ 6.1 | $ 9.5 |  | $ (116.9) | $ 17.3 |
Increase (decrease) in valuation allowance |  |  |  |  | $ 120.2 |  |  |
Federal income tax at statutory rate (as a percent) |  |  |  |  |  | 35.00% |  |
Unrecognized tax benefits | 17.6 |  |  |  |  | $ 17.6 |  | $ 19.4
Spin Off Transaction |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in valuation allowance | $ (7.1) |  |  |  |  | $ 113.1 |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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