Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents the Company’s financial assets and liabilities that are measured at fair value on a recurring basis for each of the hierarchy levels (millions of dollars):

	Total Carrying Value		Level 1		Level 2
March 31, 2012:
Money market fund	$	6.3	$	6.3	$	—
Derivative assets	$	58.7	$	—	$	58.7
Derivative liabilities	$	113.0	$	—	$	113.0
December 31, 2011:
Money market fund	$	39.0	$	39.0	$	—
Derivative assets	$	142.5	$	—	$	142.5
Derivative liabilities	$	181.7	$	—	$	181.7

Summary of Financial Instruments Carrying and Fair Values

Refer to Note I, Derivative Financial Instruments, for more details regarding derivative financial instruments, and Note H, Long-Term Debt and Financing Arrangements, for more information regarding carrying values of the long-term debt shown below.

	March 31, 2012				December 31, 2011
(millions of dollars)	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt, including current portion	$	3,442.4	$	3,637.4	$	3,452.2	$	3,623.4
Derivative assets	$	58.7	$	58.7	$	142.5	$	142.5
Derivative liabilities	$	113.0	$	113.0	$	181.7	$	181.7