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Income Tax Matters, Reconciliation Between Income Tax Provision and Statutory Income Tax Provision Table (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation between income tax provision and statutory income tax provision: |  |  |
Amount of federal income tax (provision) benefit based on the statutory rate | $ (51.5) | $ 130.1 | $ (37.5)
(Increase) decrease in federal valuation allowances | (0.3) | (0.6) | 0.0
Non-deductible compensation expense | 0.3 | (0.2) | (0.1)
Non-deductible expense | (0.3) | (0.3) | (0.3)
State income taxes, net of federal benefit | (4.2) | 4.2 | 0.0
Foreign income tax benefit | 0.5 | 0.1 | 0.3
Expiration of statute of limitations | 0.0 | 1.7 | 2.3
Advance pricing agreement | 0.0 | (0.2) | 0.0
Competent Authority settlement | 0.0 | 0.4 | 0.0
Income tax (provision) benefit | (55.5) | 135.2 | (35.3)
State and tax expense (benefit) before adjustments | 4.1 | (10.3) | 2.3
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 0.2 | (3.1) | $ 1.6
Increase (decrease) in state income tax expense (benefit) due to expiring net operating losses |  | $ (3.0) |

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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=65882285&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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