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Income Taxes, Additional Disclosures (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure |  |  |
Decrease in unrecognized tax benefits reasonably possible in the next twelve months | $ 10.0 |  |
Net accrued interest and penalties, total | 16.8 | $ 16.2 |
Interest expense and penalties related to unrecognized income tax benefits | $ 0.6 | $ 3.4 | $ 0.7
Federal |  |  |
Income Tax Disclosure |  |  |
All audit periods prior to this year are closed | 2012 |  |
State |  |  |
Income Tax Disclosure |  |  |
All audit periods prior to this year are closed | 2011 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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