Income Taxes (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Tax Disclosure [Abstract]
Effective Income Tax Rate, Continuing Operations	29.80%	15.50%
Estimated Effective Income Tax Rate Excluding Discrete Items	25.50%	16.60%
Income Tax Holiday, Aggregate Dollar Amount		$ 1.1
Increase in net income per share diluted from income tax holiday		$ 0.04
Income tax receivable, current	$ 37.6