Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Notes To Financial Statements [Abstract]

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		Level 1		Level 2		Level 3
September 30, 2017
Money market fund	$	3.2	$	3.2	$	—	$	—
Derivative assets	$	19.3	$	—	$	19.3	$	—
Derivative and non-derivative liabilities	$	594.9	$	—	$	594.9	$	—
Contingent consideration liability	$	84.0	$	—	$	—	$	84.0
December 31, 2016
Money market fund	$	4.3	$	4.3	$	—	$	—
Derivative assets	$	110.2	$	—	$	110.2	$	—
Derivative liabilities	$	97.6	$	—	$	97.6	$	—

Summary of Financial Instruments Carrying and Fair Values

	September 30, 2017				December 31, 2016
(Millions of Dollars)	Carrying Value		Fair Value		Carrying Value		Fair Value
Other investments	$	8.9	$	9.3	$	8.9	$	9.2
Derivative assets	$	19.3	$	19.3	$	110.2	$	110.2
Derivative and non-derivative liabilities	$	594.9	$	594.9	$	97.6	$	97.6
Long-term debt, including current portion	$	3,826.7	$	4,022.4	$	3,823.1	$	3,967.4