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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) |  |

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