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Income Taxes - Statutory rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of reconciliation between statutory tax rate and effective tax rate |  |  |
Statutory federal rate | 21.00% | 35.00% | 35.00%
State income taxes, net of federal benefits | (1.40%) | 4.20% | 4.50%
Adjustment to deferred tax assets as a result of the 2017 Act |  | 21.80% |
Transaction costs | (6.20%) | 5.20% |
Adjustments to contingent consideration |  | (5.00%) | (0.30%)
Excess tax benefit on share-based compensation | 15.50% |  |
Impairment of intangible assets | (15.30%) |  |
Acceleration of deductions due to change in tax law | 6.40% |  |
Other | (1.90%) | (0.40%) | 0.10%
Effective tax rate | 18.10% | 60.80% | 39.30%
Cash payments for income taxes | $ 13.4 | $ 26.2 | $ 31.6

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the acceleration of deductions due to the Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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