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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Goodwill impairments | $ 67.6 | $ 935.0 | $ 0.0 | $ 0.0 | $ 935.0 | $ 1,002.6 | $ 0.0 | $ 0.0
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows: |  |  |  |  |  |  |  |
Statutory U.S. federal income tax rate |  |  |  |  |  | 35.00% | 35.00% | 35.00%
U.S. state income taxes, net of federal benefit |  |  |  |  |  | 1.40% | 4.30% | 6.90%
Federal benefit of R&D and AMT credits, net |  |  |  |  |  | 0.10% | 2.00% | 0.50%
Foreign earnings at lower rates than U.S. federal rate |  |  |  |  |  | 0.20% | (0.50%) | (1.40%)
Federal impact of U.S. permanent differences |  |  |  |  |  | (0.10%) | (3.20%) | (8.80%)
Impact of goodwill impairments |  |  |  |  |  | (19.40%) | 0.00% | 0.00%
Valuation allowance adjustments |  |  |  |  |  | 0.70% | 13.20% | 47.70%
Other |  |  |  |  |  | (0.20%) | 1.80% | 2.20%
Effective income tax rate |  |  |  |  |  | 17.70% | 52.60% | 82.10%
Gaming |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Goodwill impairments |  | $ 935.0 |  |  |  | $ 935.0 |  |

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