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Fair Value Measurements (Carrying Amounts And Fair Values Of Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Available for sale securities, Carrying Amount $ 329.5 $ 287.0
Available for sale securities, Fair Value 329.5 [1] 287.0
Short-term borrowings, Carrying Amount 55.5 98.4
Short-term borrowings, Fair Value 55.5 [1] 98.4
Long-term borrowings, Carrying Amount 5,287.6 5,206.8
Long-term borrowings, Fair Value 5,917.3 [1] 5,790.1
Currency swap agreement, Liabilities $ 24.9 [1] $ 53.9
[1] Effective January 1, 2012, the Company is required to disclose, on a prospective basis, the level within the fair value hierarchy at which the fair values of the financial instruments are categorized. As of December 31, 2012, available-for-sale securities and short and long-term borrowings were categorized as level 1, while the currency swap agreement was categorized as level 2.