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Income Taxes (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Income Taxes |  |  |
Due to parent | $ 82,700,000 |  | $ 100,000
Unrecognized tax benefits | 50,200,000 |  |
Unrecognized tax benefits which, if recognized, would impact the company's effective tax rate | 22,000,000 |  |
Accrued interest | 3,600,000 |  |
Effective tax rate (as a percent) | 24.50% | 30.60% |
Combined federal and state expected statutory tax rate (as a percent) | 39.60% | 39.20% |
AEPC |  |  |
Income Taxes |  |  |
Due to parent | 82,700,000 |  |
Federal taxes paid to AEPC under the Tax Allocation Agreement | 0 | 0 |
Accounting Standards Update 2013-11 |  |  |
Income Taxes |  |  |
Unrecognized tax benefits | $ 12,600,000 |  |

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- Definition Percentage 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 12 -URI http://asc.fasb.org/extlink&oid=6907707&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=6907707&loc=d3e32698-109319 Reference 3: 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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