Retirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Compensation and Retirement Disclosure [Abstract]

Expense for defined contribution and defined benefit pension plans and other post employment defined benefit plans [Text Block]

	Year Ended December 31,
(millions of dollars)	2011		2010		2009
Defined contribution expense	$	18.9	$	19.2	$	16.6
Defined benefit pension expense	17.5		19.8		33.1
Other post employment benefit expense	13.5		17.5		(48.4		)
Total	$	49.9	$	56.5	$	1.3

Reconciliation of the plans' benefit obligations, plan assets, funded status and recognition [Text Block]

	Pension benefits												Other post
	Year Ended December 31,												employment benefits
	2011						2010						Year Ended December 31,
(millions of dollars)	US			Non-US			US			Non-US			2011			2010
Change in projected benefit obligation:
Projected benefit obligation, January 1	$	326.2		$	326.0		$	316.5		$	326.5		$	261.9		$	278.5
Service cost	—			9.1			—			7.4			0.7			0.8
Interest cost	16.1			17.8			17.5			17.6			11.8			14.5
Plan participants’ contributions	—			0.3			—			0.5			—			—
Plan amendments	—			(0.5		)	—			1.2			3.9			—
Actuarial (gain) loss	21.8			11.9			19.2			(0.4		)	(6.8		)	(7.2		)
Currency translation	—			(5.8		)	—			(12.2		)	—			—
Other	—			0.9			1.1			0.1			—			—
Benefits paid	(26.7		)	(15.4		)	(28.1		)	(14.7		)	(20.5		)	(24.7		)
Projected benefit obligation, December 31	$	337.4		$	344.3		$	326.2		$	326.0		$	251.0		$	261.9
Change in plan assets:
Fair value of plan assets, January 1	$	287.2		$	154.6		$	269.1		$	144.0
Actual return on plan assets	8.9			5.0			35.6			14.2
Employer contribution	21.0			16.0			10.6			14.5
Plan participants’ contribution	—			0.3			—			0.5
Currency translation	—			(0.7		)	—			(3.9		)
Other	—			(4.9		)	—			—
Benefits paid	(26.7		)	(15.4		)	(28.1		)	(14.7		)
Fair value of plan assets, December 31	$	290.4		$	154.9		$	287.2		$	154.6
Funded status	$	(47.0	)	$	(189.4	)	$	(39.0	)	$	(171.4	)	$	(251.0	)	$	(261.9	)
Amounts recognized in the Consolidated Balance Sheets consist of:
Non-current assets	$	—		$	0.5		$	—		$	0.5		$	—		$	—
Current liabilities	(0.1		)	(6.5		)	(0.1		)	(8.1		)	(24.3		)	(26.5		)
Non-current liabilities	(46.9		)	(183.4		)	(38.9		)	(163.8		)	(226.7		)	(235.4		)
Net amount recognized	$	(47.0	)	$	(189.4	)	$	(39.0	)	$	(171.4	)	$	(251.0	)	$	(261.9	)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss	$	172.8		$	54.4		$	145.7		$	37.4		$	106.3		$	120.0
Net prior service cost (credit)	(11.3		)	0.8			(12.1		)	1.4			(48.7		)	(59.5		)
Net amount recognized*	$	161.5		$	55.2		$	133.6		$	38.8		$	57.6		$	60.5
Total accumulated benefit obligation for all plans	$	337.4		$	327.9		$	326.2		$	316.8

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* AOCI shown above does not include our equity investee, NSK-Warner. NSK-Warner had an AOCI loss of $6.9 million and $6.1 million at December 31, 2011 and 2010, respectively.

Funded status of pension plans with accumulated benefit obligations in excess of plan assets [Text Block]

	December 31,
(millions of dollars)	2011			2010
Accumulated benefit obligation	$	(656.9	)	$	(634.9	)
Plan assets	435.5			432.2
Deficiency	$	(221.4	)	$	(202.7	)
Pension deficiency by country:
United States	$	(47.0	)	$	(39.0	)
United Kingdom	(13.4		)	(7.5		)
Germany	(128.7		)	(128.0		)
Other	(32.3		)	(28.2		)
Total pension deficiency	$	(221.4	)	$	(202.7	)

Weighted average asset allocations of funded pensions plans and target allocations [Text Block]

	December 31,				Target Allocation
	2011		2010
U.S. Plans:
Real estate and other	11	%	11	%	5%-15%
Fixed income securities	54	%	40	%	45%-65%
Equity securities	35	%	49	%	25%-45%
	100	%	100	%
Non-U.S. Plans:
Real estate and other	8	%	9	%	5%-10%
Fixed income securities	41	%	36	%	35%-45%
Equity securities	51	%	55	%	50%-60%
	100	%	100	%

Components of net periodic benefit cost [Text Block]

See the table below for a breakout net periodic benefit cost between U.S. and non-U.S. pension plans:

	Pension benefits																		Other post employment benefits
	Year Ended December 31,
	2011						2010						2009						Year Ended December 31,
(millions of dollars)	US			Non-US			US			Non-US			US			Non-US			2011			2010			2009
Service cost	$	—		$	9.1		$	—		$	7.4		$	0.3		$	9.9		$	0.7		$	0.8		$	0.8
Interest cost	16.1			17.8			17.5			17.6			20.7			16.5			11.8			14.5			18.6
Expected return on plan assets	(20.8		)	(11.2		)	(19.7		)	(9.7		)	(16.2		)	(9.6		)	—			—			—
Settlements, curtailments and other	—			(0.1		)	—			—			3.3			0.6			—			—			(61.9		)	*
Amortization of unrecognized prior service benefit	(0.7		)	—			(0.7		)	—			(0.5		)	—			(6.9		)	(6.9		)	(13.2		)
Amortization of unrecognized loss	6.5			0.8			6.6			0.8			7.3			0.8			7.9			9.1			7.3
Net periodic benefit cost (benefit)	$	1.1		$	16.4		$	3.7		$	16.1		$	14.9		$	18.2		$	13.5		$	17.5		$	(48.4	)

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*In the year ended December 31, 2009, the other post employment benefits settlement/curtailment of $61.9 million, in the table above, was offset by a $34.0 million cost to settle, resulting in a net pre-tax gain of $27.9 million. Excluding the $61.9 million settlement/curtailment gain, the Company's 2009 other post employment benefit expense was $13.5 million.

Defined benefit plan weighted average assumptions used in calculating benefit obligations [Text Block]

	December 31,
percent	2011	2010
U.S. pension plans:
Discount rate	4.42	5.17
Rate of compensation increase	N/A	3.50
U.S. other post employment plans:
Discount rate	4.25	4.75
Rate of compensation increase	N/A	N/A
Non-U.S. pension plans:
Discount rate	5.13	5.37
Rate of compensation increase	2.78	2.80

The Company’s weighted-average assumptions used to determine the net periodic benefit cost (benefit) for its defined benefit pension and other post employment benefit plans for the years ended December 31, 2011, 2010 and 2009 were as follows:

	Year Ended December 31,
percent	2011	2010	2009
U.S. pension plans:
Discount rate	5.17	5.75	7.09
Rate of compensation increase	N/A	3.50	3.50
Expected return on plan assets	7.50	7.50	7.50
U.S. other post employment plans:
Discount rate	4.75	5.50	7.00
Rate of compensation increase	N/A	N/A	N/A
Expected return on plan assets	N/A	N/A	N/A
Non-U.S. pension plans:
Discount rate	5.37	5.47	5.72
Rate of compensation increase	2.80	2.75	2.77
Expected return on plan assets	7.07	7.12	7.10

Defined benefit plan estimated future benefit payments [Text Block]

The estimated future benefit payments for the pension and other post employment benefits are as follows:

	Pension benefits				Other post employment benefits
(millions of dollars)					w/o Medicare Part D reimbursements		with Medicare Part D reimbursements
Year	U.S.		Non-U.S.
2012	$	25.1	$	14.6	$	25.8	$	24.9
2013	25.1		16.0		25.0		24.1
2014	24.6		17.2		24.2		23.4
2015	23.7		19.3		23.5		22.6
2016	23.6		18.5		22.5		21.7
2017-2021	110.5		103.7		99.7		96.1

Defined benefit plan effect of one percentage point change in assumed health care cost trend rates [Text Block]

A one-percentage point change in the assumed health care cost trend would have the following effects:

	One Percentage Point
(millions of dollars)	Increase		Decrease
Effect on other post employment benefit obligation	$	18.3	$	(16.1	)
Effect on total service and interest cost components	$	0.8	$	(0.7	)