Derivatives and Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

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

Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments

The recorded amounts and estimated fair values of total debt, excluding unamortized issuance costs and discounts, at December 31 were as follows:

	2017				2016
In millions	Recorded Amount		Fair Value		Recorded Amount		Fair Value
Variable rate debt	$	62.4	$	62.4	$	976.3	$	976.3
Fixed rate debt	1,385.1		1,424.0		3,320.7		3,427.1
Total debt	$	1,447.5	$	1,486.4	$	4,297.0	$	4,403.4

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

Financial assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows:

Recurring fair value measurements	December 31, 2017
In millions	Level 1		Level 2			Level 3		Total
Foreign currency contract assets	$	—	$	0.6		$	—	$	0.6
Foreign currency contract liabilities	—		(47.2		)	—		(47.2		)
Deferred compensation plan assets	42.8		6.6			—		49.4
Total recurring fair value measurements	$	42.8	$	(40.0	)	$	—	$	2.8
Nonrecurring fair value measurements (1)

Recurring fair value measurements	December 31, 2016
In millions	Level 1		Level 2			Level 3		Total
Foreign currency contract assets	$	—	$	5.5		$	—	$	5.5
Foreign currency contract liabilities	—		(5.4		)	—		(5.4		)
Deferred compensation plan assets	41.6		6.3			—		47.9
Total recurring fair value measurements	$	41.6	$	6.4		$	—	$	48.0
Nonrecurring fair value measurements (1)