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Income Tax Matters, Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Contingency |  |  |  |  |  |
Income tax provision | $ 12.0 | $ 14.5 | $ (163.8) | $ 23.9 |  |
Effective tax rate | 37.20% | 37.00% | 37.60% | 37.20% |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 1.9 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent | 5.80% |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions | $ (1.8) |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Percent | (5.40%) |  |  |  |  |
Refund adjustment from settlement | $ (9.3) |  | $ (9.3) |  |  |
Effective Income Tax Rate Reconciliation, Amount expected to be received in the next 12 months |  |  | (1.1) |  |  |
Gross unrecognized tax benefits | 1.6 |  | 1.6 |  | $ 2.2 |
Gross unrecognized tax benefits that would impact effective tax rate | 0.5 |  | $ 0.5 |  | $ 1.1 |
Audit & Advanced Pricing Agreement |  |  |  |  |  |
Income Tax Contingency |  |  |  |  |  |
Refund adjustment from settlement |  |  |  |  |  | $ 10.4
Union VEBA |  |  |  |  |  |
Income Tax Contingency |  |  |  |  |  |
Income tax benefit on removal of Union VEBA net assets | $ 184.4 |  |  |  |  |

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