Fair Value Disclosure (Details 1) (Fair Value, Inputs, Level 3 [Member], Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Fair Value of Assets [Member]
Non-recurring Level 3 fair value measurements
Fair Value of Assets	$ 1.0	$ 0.3	$ 3.2	$ 3.8
Carrying Value of Assets [Member]
Non-recurring Level 3 fair value measurements
Fair Value of Assets	2.0	0.7	5.4	9.6
Impairment Losses [Member]
Non-recurring Level 3 fair value measurements
Fair Value of Assets	$ 1.0	$ 0.4	$ 2.2	$ 5.8