Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value [Text Block]

			Basis of fair value measurements
	Balance at December 31, 2017		Quoted prices in active markets for identical items (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Valuation technique
(millions of dollars)
Assets:
Foreign currency contracts	$	1.7	$	—	$	1.7	$	—	A
Other long-term receivables (insurance settlement agreement note receivable)	$	42.9	$	—	$	42.9	$	—	C
Liabilities:
Foreign currency contracts	$	5.0	$	—	$	5.0	$	—	A

			Basis of fair value measurements
(millions of dollars)	Balance at December 31, 2016		Quoted prices in active markets for identical items (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Valuation technique
Assets:
Commodity contracts	$	0.1	$	—	$	0.1	$	—	A
Foreign currency contracts	$	7.2	$	—	$	7.2	$	—	A
Other long-term receivables (insurance settlement agreement note receivable)	$	71.5	$	—	$	71.5	$	—	C
Liabilities:
Foreign currency contracts	$	1.1	$	—	$	1.1	$	—	A

Fair value defined benefit plan assets measured at recurring and non-recurring basis [Text Block]

			Basis of fair value measurements
(millions of dollars)	Balance at December 31, 2017		Quoted prices in active markets for identical items (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Valuation technique	Assets measured at NAV (a)
U.S. Plans:
Fixed income securities	$	127.1	$	1.3	$	—	$	—	A	125.8
Equity securities	86.7		13.5		—		—		A	73.2
Real estate and other	26.3		19.9		0.4		—		A	6.0
	$	240.1	$	34.7	$	0.4	$	—		$	205.0
Non-U.S. Plans:
Fixed income securities	$	212.4	$	—	$	—	$	—	A	212.4
Equity securities	233.9		105.4		—		—		A	128.5
Real estate and other	37.1		—		—		—		A	37.1
	$	483.4	$	105.4	$	—	$	—		$	378.0

			Basis of fair value measurements
(millions of dollars)	Balance at December 31, 2016		Quoted prices in active markets for identical items (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Valuation technique	Assets measured at NAV (a)
U.S. Plans:
Fixed income securities	$	113.8	$	15.3	$	—	$	—	A	98.5
Equity securities	94.2		37.2		—		—		A	57.0
Real estate and other	21.5		13.1		0.5		—		A	7.9
	$	229.5	$	65.6	$	0.5	$	—		$	163.4
Non-U.S. Plans:
Fixed income securities	$	183.4	$	—	$	—	$	—	A	183.4
Equity securities	190.8		87.1		—		—		A	103.7
Real estate and other	19.6		—		—		—		A	19.6
	$	393.8	$	87.1	$	—	$	—		$	306.7

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(a) Certain assets that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. These amounts represent investments in commingled and managed funds which have underlying assets in fixed income securities, equity securities, and other assets.