Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Effective tax rate (in hundredths)	29.70%	40.40%	25.90%	31.70%
Discrete tax charge, other adj				$ 0.3
Estimated reduction of unrecognized tax benefits	2.1		2.1
Accrued interest and penalties	0.6		0.6		0.5
Discrete tax benefit, R&D credit			1.3
Discrete tax charge, change in enacted tax rate	1.3	0.8
Discrete tax charge, foreign tax credit		$ 1.0