Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Country	Mar. 31, 2014	Dec. 31, 2014
Income Taxes [Abstract]
Effective income tax rate (in hundredths)	41.50%	40.40%
U.S. Federal statutory rate (in hundredths)	35.00%
Expected annual effective income tax rate	approximately 38%
Gross unrecognized tax benefits, including interest and penalties	$ 31.4		$ 30.8
Related tax benefits	(1.4)		(1.4)
Net unrecognized tax benefits	$ 30.0		$ 29.4
Number of countries and territories in which the Company operates	80