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Income Taxes - Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Valuation allowance |  |
Valuation allowance | $ 95.6 | $ 107.3
Net decrease in U.S. and foreign valuation allowances | 11.7 | 71.4
Estimated cumulative amount of earnings from foreign subsidiaries that are permanently invested | 609.3 |
U.S. Federal |  |
Valuation allowance |  |
Valuation allowance | 46.8 | 58.1
Deferred tax assets | U.S. Federal |  |
Valuation allowance |  |
Valuation allowance | 0.0 | 10.4
Deferred tax assets | State |  |
Valuation allowance |  |
Valuation allowance | 34.1 | 36.5
Tax credit carryforward | Foreign |  |
Valuation allowance |  |
Valuation allowance | 12.7 | 11.2
Net operating loss (NOL) carry forwards | Foreign |  |
Valuation allowance |  |
Valuation allowance | $ 48.8 | $ 49.2
Minimum |  |
Valuation allowance |  |
Foreign statutory income tax rate | 0.00% |
Maximum |  |
Valuation allowance |  |
Foreign statutory income tax rate | 48.00% |

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