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Income Tax Matters, Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 26, 2016 $ / shares | Apr. 22, 2016 | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Tax Contingency |  |  |  |  |  |  |  |  |  |
Income tax provision (benefit) |  |  |  | $ 15.7 | $ 12.0 |  | $ 30.8 | $ (163.8) |  |
Effective tax rate |  |  |  | 37.70% | 37.20% |  | 37.10% | 37.60% |  |
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount |  |  |  |  | $ 1.9 |  |  |  |  |
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, percent |  |  |  |  | 5.80% |  |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  |  |  | $ 1.8 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Percent |  |  |  |  | (5.40%) |  |  |  |  |
Gross unrecognized tax benefits |  |  |  | $ 1.7 |  |  | $ 1.7 |  |  | $ 1.7
Gross unrecognized tax benefits that would impact effective tax rate |  |  |  | $ 0.6 |  |  | $ 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 |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency |  |  |  |  |  |  |  |  |  |
Preferred Stock, Rights Conversion Ratio into Preferred Stock |  |  | 1 |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares |  | $ 400.00 |  |  |  |  |  |  |  |
Preferred Stock, Rights Waiting Period, Duration Before Exercisable After Public Announcement |  | 10 days |  |  |  |  |  |  |  |
Preferred Stock, Rights Waiting Period, Duration Before Exercisable After Tender or Exchange Offer Results in Becoming an Acquiring Person |  | 10 days |  |  |  |  |  |  |  |
Value of right to purchase shares of the acquiring or other appropriate entity |  |  | 2 |  |  |  |  |  |  |
[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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