Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	28.90%	29.20%
Statutory rate (percent)	35.00%	35.00%
Unrecognized tax benefits, interest and penalties accrued	$ 1.1
Unrecognized tax benefits	10.5
Unrecognized tax benefits that would decrease the effective tax rate if recognized	$ 10.4