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Employee Benefit Plans Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2014

Employee Benefit Plans [Abstract]

Schedule of Assumptions Used [Table Text Block]

	Pension Benefits																		OPEB
	2014						2013						2012						2014			2013			2012
	U.S.			U.K			U.S.			U.K			U.S.			U.K.
Discount rate	4.10	%		3.70	%		5.00	%		4.50	%		4.10	%		4.30	%		4.15	%		4.95	%		4.05	%
Expected return on plan assets	7.50	%		5.00	%		7.50	%		5.15	%		7.50	%		4.35	%		N/A			N/A			N/A
Rate of compensation increase	4.00	%		3.30	%		4.00	%		3.60	%		4.00	%		3.15	%		4.00	%		4.00	%		4.00	%

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

	Pension Benefits								OPEB
	December 31,								December 31,
	2014				2013				2014				2013
	(in millions)								(in millions)
Change in benefit obligation
Benefit obligation at beginning of year	$	755.4			$	842.8			$	577.9			$	601.3
Service cost	3.5				3.4				0.3				0.4
Interest cost	36.1				33.8				15.3				13.2
Plan amendments	—				—				—				(8.1		)
Actuarial loss (gain)	119.3				(92.6		)		41.2				(0.7		)
Change in GM portion of OPEB obligation	—				—				31.8				(17.0		)
Participant contributions	0.4				0.4				—				—
Settlements	(131.1		)		—				—				—
Benefit payments	(36.5		)		(35.3		)		(11.8		)		(11.2		)
Currency fluctuations	(8.3		)		2.9				—				—
Net change	(16.6		)		(87.4		)		76.8				(23.4		)
Benefit obligation at end of year	$	738.8			$	755.4			$	654.7			$	577.9
Change in plan assets
Fair value of plan assets at beginning of year	$	713.4			$	695.4			$	—			$	—
Actual return on plan assets	77.2				49.2				—				—
Employer contributions	1.9				0.8				11.8				11.2
Participant contributions	0.4				0.4				—				—
Benefit payments	(36.5		)		(35.3		)		(11.8		)		(11.2		)
Settlements	(104.2		)		—				—				—
Currency fluctuations	(8.5		)		2.9				—				—
Net change	(69.7		)		18.0				—				—
Fair value of plan assets at end of year	$	643.7			$	713.4			$	—			$	—

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

	Pension Benefits								OPEB
	December 31,								December 31,
	2014				2013				2014				2013
	(in millions)								(in millions)
Noncurrent assets	$	6.9			$	9.3			$	—			$	—
Current liabilities	(3.0		)		(2.3		)		(29.6		)		(30.8		)
Noncurrent liabilities	(99.0		)		(49.0		)		(625.1		)		(547.1		)
Net liability	$	(95.1	)		$	(42.0	)		$	(654.7	)		$	(577.9	)

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

	Pension Benefits								OPEB
	December 31,								December 31,
	2014				2013				2014				2013
	(in millions)								(in millions)
Net actuarial gain (loss)	$	(215.3	)		$	(194.3	)		$	(35.7	)		$	4.9
Net prior service credit	0.7				0.8				15.4				18.1
Total amounts recorded	$	(214.6	)		$	(193.5	)		$	(20.3	)		$	23.0

Schedule of Net Benefit Costs [Table Text Block]

	Pension Benefits												OPEB
	2014				2013				2012				2014				2013				2012
	(in millions)												(in millions)
Service cost	$	3.5			$	3.4			$	3.1			$	0.3			$	0.4			$	0.4
Interest cost	36.1				33.8				35.1				15.3				13.2				15.1
Expected asset return	(48.4		)		(45.8		)		(34.7		)		—				—				—
Amortized actuarial loss	5.4				8.9				7.8				0.5				0.9				0.6
Amortized prior service cost (credit)	(0.1		)		5.4				0.5				(2.7		)		(1.8		)		(2.0		)
Special and contractual
termination benefits	—				—				12.8				—				—				16.2
Curtailment gain	—				—				—				—				—				(21.8		)
Settlement charge (gain)	35.5				—				—				—				—				(5.2		)
Net periodic benefit cost	$	32.0			$	5.7			$	24.6			$	13.4			$	12.7			$	3.3

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

	U.S.								U.K.
							Target								Target
	2014			2013			Allocation		2014			2013			Allocation
Equity securities	33.1	%		42.5	%		30% - 65%		28.7	%		30.7	%		25% - 35%
Fixed income securities	47.3			48.5			35% - 55%		61.1			59.0			55% - 65%
Hedge funds	18.3			8.8			0% - 20%		10.1			10.2			5% - 15%
Cash	1.3			0.2			0% - 5%		0.1			0.1			0% - 5%
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]

The fair values of our pension plan assets are as follows:

December 31, 2014
Asset Categories		Level 1				Level 2				Level 3				Total
		(in millions)
Cash & Cash Equivalents		$	6.7			$	—			$	—			$	6.7
Equity
U.S. Large Cap		87.3				—				—				87.3
U.S. Small/Mid Cap		25.2				—				—				25.2
World Equity		94.2				—				—				94.2
Fixed Income Securities
Government & Agencies		67.9				58.8				—				126.7
Corporate Bonds - Investment Grade		139.9				—				—				139.9
Corporate Bonds - Non-investment Grade		31.9				—				—				31.9
Emerging Market Debt		19.0				—				—				19.0
Other		7.2				—				—				7.2
Hedge Funds
Property Funds		—				—				48.3				48.3
Multi Strategy Hedge Fund		—				—				57.3				57.3
Total Plan Assets		$	479.3			$	58.8			$	105.6			$	643.7
December 31, 2013
Asset Categories		Level 1				Level 2				Level 3				Total
		(in millions)
Cash & Cash Equivalents		$	1.5			$	—			$	—			$	1.5
Equity
U.S. Large Cap		128.0				—				—				128.0
U.S. Small/Mid Cap		49.4				—				—				49.4
World Equity		109.3				—				—				109.3
Fixed Income Securities
Government & Agencies		70.5				63.0				—				133.5
Corporate Bonds - Investment Grade		167.1				—				—				167.1
Corporate Bonds - Non-investment Grade		25.8				—				—				25.8
Emerging Market Debt		17.4				—				—				17.4
Other		16.9				—				—				16.9
Hedge Funds
Property Funds		—				—				7.1				7.1
Multi Strategy Hedge Fund		—				—				57.4				57.4
Total Plan Assets		$	585.9			$	63.0			$	64.5			$	713.4

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

	December 31,
	2014				2013
	(in millions)
Beginning balance	$	64.5			$	47.6
Actual return on plan assets:
Relating to assets still held at the reporting date	3.3				3.5
Purchases, sales and settlements, net	37.8				13.4
Ending balance	$	105.6			$	64.5

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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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-Publisher FASB

-Name Accounting Standards Codification

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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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