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Fair Value (Fair Value of Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Short term investments $ 16.5 $ 18.0
Money market funds 26.9  
Fair Value [Member]
   
Available-for-sale securities, Fair Value Disclosure 1.9 1.8
Money market funds 26.9 0
Debt maturing within one year 572.2 849.3
Long term debt 2,547.8 2,445.2
Foreign exchange forward contracts 3.4 (4.9)
Interest-rate swap agreements 93.1 147.6
Carrying Amount [Member]
   
Available-for-sale securities, Fair Value Disclosure 1.9 1.8
Money market funds 26.9 0
Debt maturing within one year 572.0 [1] 849.3 [1]
Long term debt 2,623.9 [1] 2,459.1 [1]
Foreign exchange forward contracts 3.4 (4.9)
Interest-rate swap agreements $ 93.1 $ 147.6
[1] (1) The carrying value of debt maturing within one year and long-term debt is net of related discount or premium as well as unrealized gains from interest-rate swap agreements.