Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Contingency [Line Items]
Effective tax rate	11.90%	22.50%
Federal statutory rate	35.00%	35.00%
Income tax benefit (expense)	$ 6.5	$ 19.8
Domestic Tax Authority
Income Tax Contingency [Line Items]
Federal statutory rate	16.00%	29.40%
Foreign Tax Authority
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	1.30%	(0.10%)
Tax Year 2005 to 2006 [Member] | Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Income tax benefit (expense)	5.0
Tax Assessment Year 2007 to 2009 | Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Income Tax Examination, Increase (Decrease) in Liability from Prior Year	69.3
Income Tax Examination, Increase (Decrease) in Liability from Prior Year, Related to Items with Unallowable Deductions	$ 60.2