Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value

			Basis of fair value measurements
(millions of dollars)	Balance at June 30, 2013		Quoted prices in active markets for identical items (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Valuation technique
Assets:
Foreign currency contracts	$	2.4	$	—	$	2.4	$	—	A
Other non-current assets (insurance settlement agreement note receivable)	$	35.4	$	—	$	35.4	$	—	C
Liabilities:
Foreign currency contracts	$	11.9	$	—	$	11.9	$	—	A
Net investment hedge contracts	$	32.0	$	—	$	32.0	$	—	A

			Basis of fair value measurements
(millions of dollars)	Balance at December 31, 2012		Quoted prices in active markets for identical items (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Valuation technique
Assets:
Foreign currency contracts	$	5.9	$	—	$	5.9	$	—	A
Other non-current assets (insurance settlement agreement note receivable)	$	41.0	$	—	$	41.0	$	—	C
Liabilities:
Foreign currency contracts	$	9.8	$	—	$	9.8	$	—	A
Net investment hedge contracts	$	58.1	$	—	$	58.1	$	—	A