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Income Tax Matters, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Income Tax Contingency |  |  |  |
Income tax provision (benefit) |  | $ 15.1 | $ (175.8) |
Effective tax rate |  | 36.50% | 37.60% |
Effective income tax rate reconciliation, share-based compensation cost, amount |  | $ 0.7 |  |
Effective income tax rate reconciliation, share-based compensation cost, percent |  | (1.70%) |  |
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount |  | $ 0.3 |  |
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, percent |  | 0.70% |  |
Gross unrecognized tax benefits |  | $ 1.7 |  | $ 1.7
Gross unrecognized tax benefits that would impact effective tax rate |  | 0.6 |  | 0.6
Cumulative-effect adjustment | [1] |  |  | 0.7
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect |  |  |  |
Income Tax Contingency |  |  |  |
Cumulative-effect adjustment | [1] |  |  | $ 0.7
Union VEBA |  |  |  |
Income Tax Contingency |  |  |  |
Income tax benefit on removal of Union VEBA net assets |  | $ 184.4 | $ 184.4 |
[1] | See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

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