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Fair Value (Fair Value of Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Short term investments $ 17.8 $ 18.0
Healthcare trust assets 34.1 0
Carrying Amount [Member]
   
Cash and cash equivalents 1,097.5 1,245.1
Available-for-sale securities 1.8 1.8
Grantor trust cash and cash equivalents 0 0.7
Short term investments 17.8 18.0
Cash surrender value of supplemental life insurance 42.2 41.9
Healthcare trust assets 34.1 0
Debt maturing within one year 684.5 849.3
Long-term debt, net of related discount or premium 2,628.3 2,459.1
Foreign exchange forward contracts 4.5 (4.9)
Interest-rate swap agreements 100.9 147.6
Fair Value [Member]
   
Cash and cash equivalents 1,097.5 1,245.1
Available-for-sale securities 1.8 1.8
Grantor trust cash and cash equivalents 0 0.7
Short term investments 17.8 18.0
Cash surrender value of supplemental life insurance 42.2 41.9
Healthcare trust assets 34.1 0
Debt maturing within one year 690.5 849.3
Long-term debt, net of related discount or premium 2,680.2 2,445.2
Foreign exchange forward contracts 4.5 (4.9)
Interest-rate swap agreements $ 100.9 $ 147.6