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Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal tax provision at statutory rate | $ 70.9 | $ 121.5 | $ 99.2
State taxes, net of federal income tax benefit | 16.1 | 13.3 | 10.8
Equity investment basis difference | 0.0 | 0.0 | 9.5
Non-deductible items | 1.5 | 1.3 | 1.4
Permanent differences related to stock-based compensation | (0.1) | (0.8) | 0.1
Net change in valuation allowance | 0.5 | 0.3 | (5.1)
General business credits | (1.1) | (0.9) | (28.0)
Deferred revaluation for change in statutory tax rate | (15.8) | (32.9) | 0.0
Other | (0.2) | 0.1 | (1.5)
Total | $ 71.8 | $ 101.9 | $ 86.4

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