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Income Taxes - Statutory rate (Details) - USD ($) $ in Millions	12 Months Ended
	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

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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.

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