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Income Taxes Deferred Income Tax Asset and Liability Components - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Valuation Allowance [Line Items] |  |  |
Income tax provision at statutory rate, % | 21.00% | 21.00% | 35.00%
Net deferred tax liability | $ 135.1 | $ 89.8 |
Income taxes receivable | 1.5 | 8.1 |
Gross domestic state net operating loss carryforwards | 96.6 |  |
State tax credits | 2.9 |  |
Deferred tax asset | 6.8 |  |
Valuation allowance | 4.5 | $ 8.9 |
Deferred Tax Asset, Loss Carry Forwards |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | $ 4.5 |  |

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