Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]

Financial Assets And Liabilities Carried At Fair Value

A summary of financial assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2012 and 2011 were as follows ($ in millions):

	Quoted Prices in Active Market (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)	Total
December 31, 2012:
Assets:
Available-for-sale securities	$	329.5	—		—	$	329.5
Liabilities:
Deferred compensation plans	—		$	64.5	—	64.5
Currency swap agreement	—		24.9		—	24.9
December 31, 2011:
Assets:
Available-for-sale securities	$	287.0	—		—	$	287.0
Liabilities:
Deferred compensation plans	—		$	58.2	—	58.2
Currency swap agreement	—		53.9		—	53.9

Carrying Amounts And Fair Values Of Financial Instruments

The carrying amounts and fair values of financial instruments as of December 31, 2012 and 2011 were as follows ($ in millions):

	2012				2011
	Carrying Amount		Fair Value (1)		Carrying Amount		Fair Value
Financial Assets:
Available-for-sale securities	$	329.5	$	329.5	$	287.0	$	287.0
Liabilities:
Short-term borrowings	55.5		55.5		98.4		98.4
Long-term borrowings	5,287.6		5,917.3		5,206.8		5,790.1
Currency swap agreement	24.9		24.9		53.9		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