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Income Taxes - Statutory rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of reconciliation between statutory tax rate and effective tax rate
Statutory federal rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefits	4.20%	4.50%	4.20%
Change in rate due to the 2017 Act	21.80%
Transaction costs	5.20%
Adjustments to contingent consideration	(5.00%)	(0.30%)
Other	(0.40%)	0.10%	0.30%
Effective tax rate	60.80%	39.30%	39.50%
Cash payments for income taxes	$ 26.2	$ 31.6	$ 28.5

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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 adjustments to contingent consideration.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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