Fair Value Measurements of Assets and Liabilities (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2010	Dec. 31, 2009
Fair Value Measurement of Nonfinancial Assets on a Nonrecurring Basis
Goodwill	$ 137.0	$ 342.9
Goodwill impairment	204.0	73.0
Fair Value Assets Measured on Nonrecurring Basis	137.0	342.9
Fair Value Assets Measured on Nonrecurring Basis, Total Losses	204.0	73.0
Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement of Nonfinancial Assets on a Nonrecurring Basis
Goodwill	0	0
Fair Value Assets Measured on Nonrecurring Basis	0	0
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement of Nonfinancial Assets on a Nonrecurring Basis
Goodwill	0	0
Fair Value Assets Measured on Nonrecurring Basis	0	0
Fair Value Measurements at Reporting Date Using: Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement of Nonfinancial Assets on a Nonrecurring Basis
Goodwill	137.0	342.9
Fair Value Assets Measured on Nonrecurring Basis	$ 137.0	$ 342.9

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details