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2. Fair Value Investments (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Carrying (Reported) Amount, Fair Value Disclosure [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Other assets$ 166.6$ 145.6
Current maturities of long-term debt, excluding leases0225.0
Total long-term debt, excluding capital leases and current maturities718.9718.2
Estimate of Fair Value, Fair Value Disclosure [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Other assets229.2205.6
Current maturities of long-term debt, excluding leases0228.1
Total long-term debt, excluding capital leases and current maturities$ 756.9$ 734.8