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Income Taxes - Statutory rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	4.50%	4.20%	4.20%
Other	(0.20%)	0.30%	0.30%
Effective tax rate	39.30%	39.50%	39.50%
Cash payments for income taxes	$ 31.6	$ 28.5	$ 30.8

X

- Definition

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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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 other adjustments.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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