Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	32.00%	31.20%	31.60%	31.40%
Unrecognized tax benefits	$ 30.0		$ 30.0		$ 31.6
Unrecognized tax benefits adjusted	26.2		26.2		28.2
Amount of unrecognized tax benefits where significant change is reasonably possible	1.0		1.0		4.4
Accrued income tax interest and penalties					$ 5.7
Increase (decrease) in accrued income tax interest and penalties	$ 0.0		$ 0.0