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Fair Value Measurements Impairment losses (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2011
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]            
Impairment charge of assets no longer used           $ 3.6
Impairment of Long-Lived Assets Held-for-use         2.5 1.9
Gain (loss) on sale or impairment of long lived assets, net $ (0.1) $ (2.5) $ (0.2) $ (8.0)