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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Employee Benefit Plans [Abstract]

Schedule of Assumptions Used [Table Text Block]

	Pension Benefits																		OPEB
	2012						2011						2010						2012			2011			2010
	U.S.			U.K			U.S.			U.K			U.S.			U.K.
Discount rate	4.01	%		4.30	%		5.10	%		4.65	%		5.70	%		5.35	%		4.05	%		5.10	%		5.70	%
Expected return on plan assets	7.50	%		4.35	%		8.00	%		4.60	%		8.00	%		6.00	%		N/A			N/A			N/A
Rate of compensation increase	4.00	%		3.15	%		4.00	%		3.25	%		3.75	%		3.65	%		4.00	%		4.00	%		3.75	%

Change in Benefit Obligation and Plan Assets [Table Text Block]

	Pension Benefits								OPEB
	December 31,								December 31,
	2012				2011				2012				2011
	(in millions)								(in millions)
Change in benefit obligation
Benefit obligation at beginning of year	$	716.7			$	665.4			$	588.4			$	564.3
Service cost	3.1				4.8				0.4				0.9
Interest cost	35.1				37.1				15.1				17.1
Plan amendments	6.1				—				—				—
Actuarial loss (gain)	97.3				45.5				(7.1		)		11.4
Change in GM portion of OPEB obligation	—				—				2.4				16.2
Participant contributions	0.5				0.6				—				—
Special and contractual termination benefits	12.8				—				18.3				—
Curtailments	—				(2.5		)		—				(10.0		)
Settlements	—				—				(4.7		)		—
Benefit payments	(34.2		)		(33.7		)		(11.5		)		(11.5		)
Currency fluctuations	5.4				(0.5		)		—				—
Net change	126.1				51.3				12.9				24.1
Benefit obligation at end of year	$	842.8			$	716.7			$	601.3			$	588.4
Change in plan assets
Fair value of plan assets at beginning of year	$	441.7			$	412.4			$	—			$	—
Actual return on plan assets	57.3				11.0				—				—
Employer contributions	225.4				52.0				11.5				11.5
Participant contributions	0.5				0.6				—				—
Benefit payments	(34.2		)		(33.7		)		(11.5		)		(11.5		)
Currency fluctuations	4.7				(0.6		)		—				—
Net change	253.7				29.3				—				—
Fair value of plan assets at end of year	$	695.4			$	441.7			$	—			$	—

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

	Pension Benefits								OPEB
	December 31,								December 31,
	2012				2011				2012				2011
	(in millions)								(in millions)
Noncurrent Assets	$	11.8			$	—			$	—			$	—
Current liabilities	(1.3		)		(1.2		)		(28.6		)		(29.4		)
Noncurrent liabilities	(157.9		)		(273.8		)		(572.7		)		(559.0		)
Net liability	$	(147.4	)		$	(275.0	)		$	(601.3	)		$	(588.4	)

Schedule of Pre-tax Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

	Pension Benefits								OPEB
	December 31,								December 31,
	2012				2011				2012				2011
	(in millions)								(in millions)
Net actuarial gain (loss)	$	(298.6	)		$	(230.3	)		$	3.3			$	(1.8	)
Net prior service credit (cost)	(4.7		)		0.9				11.8				13.6
Deferred curtailment gain	—				—				—				22.0
Total amounts recorded	$	(303.3	)		$	(229.4	)		$	15.1			$	33.8

Schedule of Net Benefit Costs [Table Text Block]

	Pension Benefits												OPEB
	2012				2011				2010				2012				2011				2010
	(in millions)												(in millions)
Service cost	$	3.1			$	4.8			$	4.9			$	0.4			$	0.9			$	1.0
Interest cost	35.1				37.1				36.8				15.1				17.1				16.1
Expected asset return	(34.7		)		(31.9		)		(31.8		)		—				—				—
Amortized actuarial loss (gain)	7.8				4.5				2.5				0.6				0.4				(1.4		)
Amortized prior service cost (credit)	0.5				(0.1		)		—				(2.0		)		(3.2		)		(3.1		)
Special and contractual
termination benefits	12.8				—				—				16.2				—				—
Curtailments	—				—				0.2				(21.8		)		—				—
Settlement	—				0.1				—				(5.2		)		—				—
Net periodic benefit cost	$	24.6			$	14.5			$	12.6			$	3.3			$	15.2			$	12.6

Schedule of Weighted Average Allocation of Pension Plan Assets [Table Text Block]

	U.S.								U.K.
							Target								Target
	2012			2011			Allocation		2012			2011			Allocation
Equity securities	38.3	%		50.8	%		35% - 65%		34.8	%		44.5	%		30% - 40%
Fixed income securities	52.3			35.5			35% - 50%		55.1			47.9			50% - 60%
Hedge funds	8.5			13.5			0% - 15%		—			—			0% - 10%
Cash	0.9			0.2			0% - 5%		10.1			7.6			0% - 10%
Total	100.0	%		100.0	%				100.0	%		100.0	%

Schedule of Fair Value Hierarchy by Asset Category for Postretirement Benefit Plan Assets [Table Text Block]

December 31, 2012
Asset Categories		Level 1				Level 2				Level 3				Total
		(in millions)
Cash & Cash Equivalents		$	18.5			$	—			$	—			$	18.5
Equity
U.S. Large Cap		104.0				—				—				104.0
U.S. Small/Mid Cap		46.9				—				—				46.9
World Equity		111.2				—				—				111.2
Fixed Income Securities
Government & Agencies		100.4				—				—				100.4
Corporate Bonds - Investment Grade		204.9				—				—				204.9
Corporate Bonds - Non-investment Grade		26.4				—				—				26.4
Emerging Market Debt		20.5				—				—				20.5
Other		15.0				—				—				15.0
Hedge Funds
Multi Strategy Hedge Fund		—				—				47.6				47.6
Total Plan Assets		$	647.8			$	—			$	47.6			$	695.4
December 31, 2011
Asset Categories		Level 1				Level 2				Level 3				Total
		(in millions)
Cash & Cash Equivalents		$	8.0			$	—			$	—			$	8.0
Equity
U.S. Large Cap		88.6				—				—				88.6
U.S. Small/Mid Cap		43.5				—				—				43.5
World Equity		65.3				20.6				—				85.9
Fixed Income Securities
Government & Agencies		56.6				—				—				56.6
Corporate Bonds - Investment Grade		68.5				—				—				68.5
Corporate Bonds - Non-investment Grade		25.3				—				—				25.3
Emerging Market Debt		11.8				—				—				11.8
Other		7.0				—				—				7.0
Hedge Funds
Multi Strategy Hedge Fund		—				—				46.5				46.5
Total Plan Assets		$	374.6			$	20.6			$	46.5			$	441.7

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

	December 31,
	2012				2011
	(in millions)
Beginning balance	$	46.5			$	35.7
Actual return on plan assets:
Relating to assets still held at the reporting date	1.1				(0.5		)
Purchases, sales and settlements, net	—				11.3
Ending balance	$	47.6			$	46.5

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Tabular disclosure of the major categories of postretirement benefit plan assets, and the fair value levels associated with each respective asset category.

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Tabular disclosure of the major categories of plan assets of defined benefit pension plans. This information includes the target allocation of plan assets, as well as the weighted average allocation of each category of assets as a percentage of total plan assets.

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Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized.

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Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost.

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Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.

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Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period.

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Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

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