Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Income Tax Contingency [Line Items]
Unrecognized tax benefits relating to UTPs	$ 80.0
Unrecognized tax benefits, interest on income taxes accrued	4.6
Unrecognized tax benefits, income tax penalties accrued	9.0
Potential change in unrecognized tax benefits during next twelve months	2.7
Unrecognized tax benefits that would reduce the income tax provision	37.1
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Statute of limitations to expire during next twelve months	2010
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Statute of limitations to expire during next twelve months	2007 & 2009
Loss Carry Back 2013 [Member]
Income Tax Contingency [Line Items]
Income taxes receivable	$ 12.6