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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation between income tax provision and statutory income tax provision: |  |  |
Amount of federal income tax benefit (provision) based on the statutory rate | $ 130.1 | $ (37.5) | $ (50.1)
(Increase) decrease in federal valuation allowances | (0.6) | 0.0 | 0.1
Non-deductible compensation expense | (0.2) | (0.1) | (0.3)
Non-deductible expense | (0.3) | (0.3) | (0.9)
State income taxes, net of federal benefit | 4.2 | 0.0 | (4.4)
Foreign income tax benefit | 0.1 | 0.3 | 0.0
Expiration of statute of limitations | 1.7 | 2.3 | 4.6
Settlement with taxing authorities | 0.0 | 0.0 | 4.4
Advance pricing agreement | (0.2) | 0.0 | 2.9
Competent Authority settlement | 0.4 | 0.0 | 5.3
Income tax benefit (provision) | 135.2 | (35.3) | (38.4)
State and tax expense (benefit) before adjustments | (10.3) | 2.3 | 4.4
Increase (decrease) in state tax expense (benefit) due to change in tax rate | 3.1 | $ (1.6) |
Increase (decrease) in state income tax expense (benefit) due to expiring net operating losses | $ 3.0 |  |
Increase (decrease) in state tax expense (benefit) due to change in valuation allowance |  |  | $ 1.2

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