Fair Value Measurements Impairment losses (Details) (USD $) In Millions	3 Months Ended		9 Months Ended		3 Months Ended			9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2011 Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2010 Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Asset Impairment Charges	$ 62.0
Impairment charge of assets no longer used					2.4	3.6
Impairment of Long-Lived Assets Held-for-use					0.5			4.4
Other than Temporary Impairment Losses, Investments	0	16.9	0	16.9			16.9	1.2
Gain (loss) on sale or impairment of long lived assets, net	$ (65.0)	$ (0.9)	$ (73.0)	$ (2.1)