Income Taxes (Tax Examinations) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Income Tax Examination [Line Items]
Unrecognized tax benefit recognition including interest and penalties, if recognized, would effect income tax expense	$ 5.0	$ 27.5
Tax Assessment Year 2007 to 2009 [Member] | IRS
Income Tax Examination [Line Items]
Tax Examination		68.3
Tax Assessment Year 2007 to 2009 [Member] | Assessment related to temporary differences [Member] | IRS
Income Tax Examination [Line Items]
Tax Examination		60.2
Tax Assessment Year 2005 to 2006 [Member] | IRS
Income Tax Examination [Line Items]
Tax Examination		3.3
Tax Assessment Year 2005 to 2006 [Member] | Assessment related to temporary differences [Member] | IRS
Income Tax Examination [Line Items]
Tax Examination		$ 2.7