Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	29.00%	33.90%	30.30%	31.10%
Change in income tax expense due to redemption of corporate owned life insurance policies	$ 0.4
Change in income tax expense due to change in state tax rate	$ 1.6
Statutory rate (percent)	35.00%	35.00%
Unrecognized tax benefits, interest and penalties accrued	$ 1.2		$ 1.2
Unrecognized tax benefits	12.4		12.4
Unrecognized tax benefits that would decrease the effective tax rate if recognized	$ 12.3		$ 12.3