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Fair Value (Fair Value of Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Money market funds $ 7.6 $ 26.9
Carrying Amount [Member]
   
Available-for-sale securities 2.2 1.9
Money market funds 7.6 26.9
Debt maturing within one year (243.1) [1] (572.0) [1]
Long-term debt (2,541.2) [1] (2,623.8) [1]
Foreign exchange forward contracts (1.5) 3.4
Interest-rate swap agreements 0 93.1
Fair Value [Member]
   
Available-for-sale securities 2.2 1.9
Money market funds 7.6 26.9
Debt maturing within one year (243.1) [1] (572.2) [1]
Long-term debt (2,560.2) [1] (2,547.7) [1]
Foreign exchange forward contracts (1.5) 3.4
Interest-rate swap agreements $ 0 $ 93.1
[1] (1) The carrying value of debt maturing within one year and long-term debt includes any related discount or premium, unamortized deferred gains on terminated interest-rate swap agreements, and unrealized losses from interest-rate swap agreements.