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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Income Taxes |  |  |  |  |
Net deferred income tax liability | $ 120.2 |  | $ 120.2 |  | $ 107.9
Valuation allowance | 817.9 |  | $ 817.9 |  | $ 844.3
Income tax benefit from settlement of uncertain tax positions | $ 9.8 |  |  |  |
Percent of pretax income |  |  |  |  |
Actual effective income tax rate (as a percent) | (25.56%) | 87.84% | 8.00% | 86.41% |
Correction of the failed spin-off-leaseback accounting treatment |  |  |  |  |
Income Taxes |  |  |  |  |
Period of cumulative pre-tax loss position |  |  | 3 years |  |
Rocket Games |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax benefit due to change in valuation allowance after recording acquired deferred tax liabilities | $ 12.0 |  |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
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