Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jul. 28, 2011 Tax Assessment Year 2007 to 2009 Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Effective tax rates (as a percent)	27.40%	22.10%
U.S. statutory rate (as a percent)	35.00%	35.00%
Foreign tax credit carryforwards	$ 18.7
Total tax assessment			87.0
Tax assessments related to disallowed deductions			$ 80.6