Fair Value Disclosure (Details 1) (Fair Value, Measurements, Nonrecurring [Member], Fair Value, Inputs, Level 3 [Member], USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Fair Value of Assets [Member]
Non-recurring Level 3 fair value measurements
Fair Value of Assets	$ 1.5	$ 0.5	$ 2.2	$ 3.5
Carrying Value of Assets [Member]
Non-recurring Level 3 fair value measurements
Fair Value of Assets	2.1	1.1	3.4	8.9
Impairment Losses [Member]
Non-recurring Level 3 fair value measurements
Fair Value of Assets	$ 0.6	$ 0.6	$ 1.2	$ 5.4