Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Contingency [Line Items]
Effective income tax rate	23.50%	42.90%	29.30%	43.60%
Unrecognized tax benefits, period increase			$ 0.9
Unrecognized tax benefits	$ 3.4		3.4
Effective income tax rate reconciliation, unrecognized tax benefits, amount			2.0
Unrecognized tax benefits, interest	0.2		0.2
Unrecognized tax benefits, income tax penalties	$ 0.2		0.2
Employment tax credit			10.5
Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Income tax examination, penalties and interest expense			$ 4.0