Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 33.3		$ 33.3		$ 34.5
Penalties and tax-related interest expense during period	1.3	1.2	3.9	3.5
Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued	32.3		32.3		31.5
Valuation Allowance, Amount	56.2		56.2		5.8
Valuation Allowance, Deferred Tax Asset, Change in Amount			50.4
Decrease In Liability For Uncertain Tax Positions			3.4
Minimum [Member]
Potential impact of uncertain tax positions	0		0
Maximum [Member]
Potential impact of uncertain tax positions	$ 3.1		$ 3.1