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Income Taxes - (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
U.S. federal statutory tax rate (as a percent)			21.00%	35.00%
Effective income tax rate (as a percent)	28.10%	28.30%
ASU 2016-09
Excess tax benefits from employee stock compensation benefit	$ 1.5	$ 4.6
Effective income tax rate (as a percent)	13.90%	32.90%
Net aggregate increase in valuation allowance		$ 5.3

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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The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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