Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Effective tax rate (in hundredths)	27.70%	26.50%	27.70%	24.20%
Discrete tax benefit, R&D credit				$ 1.3