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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Income Taxes |  |  |  |  |
Net deferred income tax liability | $ 112.3 |  | $ 112.3 |  | $ 107.9
Percent of pretax income |  |  |  |  |
Actual effective income tax rate (as a percent) | 24.10% | 84.47% | 24.30% | 84.59% |
Amount of pretax income |  |  |  |  |
Valuation allowance |  |  | $ 831.8 |  | $ 844.3
Correction of the failed spin-off-leaseback accounting treatment |  |  |  |  |
Income Taxes |  |  |  |  |
Period of cumulative pre-tax loss position |  |  | 3 years |  |

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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, netted by jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 + Details
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