Income Taxes (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Income Tax Contingency [Line Items]
Increase (Decrease) in Income Taxes	$ 2.1
Unrecognized tax benefits relating to UTPs	78.0
Unrecognized tax benefits, interest on income taxes accrued	7.3
Unrecognized tax benefits, income tax penalties accrued	$ 7.7
Closed tax years by major tax jurisdiction	2007
Potential change in unrecognized tax benefits during next twelve months	$ (33.7)
Unrecognized tax benefits that would reduce the income tax provision	$ 36.3
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Closed tax years by major tax jurisdiction	2008, 2009, 2010 and 2011
Statute of limitations to expire during next twelve months	2007 and 2012
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Closed tax years by major tax jurisdiction	2008 and 2009
Statute of limitations to expire during next twelve months	2007, 2010 and 2011,