Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2018

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Schedule of Assumptions Used [Table Text Block]



	Pension Benefits												OPEB
	2018				2017				2016				2018		2017		2016
	U.S.		U.K.		U.S.		U.K.		U.S.		U.K.
Discount rate	4.30	%	2.95	%	3.65	%	2.75	%	4.15	%	2.70	%	4.35	%	3.65	%	4.20	%
Expected return on plan assets	7.50	%	5.10	%	7.45	%	5.10	%	7.50	%	5.00	%	N/A		N/A		N/A
Rate of compensation increase	4.00	%	3.40	%	4.00	%	3.40	%	4.00	%	3.45	%	4.00	%	4.00	%	4.00	%

Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]

The following table summarizes the changes in projected benefit obligations and plan assets and reconciles the funded status of the benefit plans, which is the net benefit plan liability:



	Pension Benefits						OPEB
	December 31,						December 31,
	2018			2017			2018			2017
	(in millions)
Change in benefit obligation
Benefit obligation at beginning of year	$	824.0		$	717.6		$	613.3		$	571.7
Service cost	2.6			3.6			0.4			0.3
Interest cost	27.3			28.9			12.4			13.3
Plan amendments	4.3			0.5			(2.3		)	—
Actuarial loss (gain)	(63.2		)	28.1			(43.8		)	22.6
Change in GM portion of OPEB obligation	—			—			(32.6		)	16.5
Participant contributions	0.3			0.3			—			—
Curtailments	(11.6		)	—			(0.2		)	—
Settlements	(0.6		)	(14.3		)	—			—
Benefit payments	(39.7		)	(40.8		)	(9.9		)	(12.5		)
MPG acquisition / business combination	—			82.3			—			1.4
Currency fluctuations	(9.4		)	17.8			—			—
Other	0.5			—			—			—
Net change	(89.5		)	106.4			(76.0		)	41.6
Benefit obligation at end of year	$	734.5		$	824.0		$	537.3		$	613.3

Change in plan assets
Fair value of plan assets at beginning of year	$	702.2		$	611.3		$	—		$	—
Actual return on plan assets	(31.0		)	74.9			—			—
Employer contributions	4.4			4.4			9.9			12.5
Participant contributions	0.3			0.3			—			—
Benefit payments	(39.8		)	(40.8		)	(9.9		)	(12.5		)
Settlements	(0.6		)	(14.3		)	—			—
MPG acquisition / business combination	—			49.9			—			—
Currency fluctuations	(9.7		)	16.5			—			—
Net change	(76.4		)	90.9			—			—
Fair value of plan assets at end of year	$	625.8		$	702.2		$	—		$	—

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

Amounts recognized in our Consolidated Balance Sheets are as follows:



	Pension Benefits						OPEB
	December 31,						December 31,
	2018			2017			2018			2017
	(in millions)
Noncurrent assets	$	26.4		$	18.9		$	—		$	—
Current liabilities	(6.5		)	(6.0		)	(30.8		)	(30.3		)
Noncurrent liabilities	(128.6		)	(134.7		)	(506.5		)	(583.0		)
Net liability	$	(108.7	)	$	(121.8	)	$	(537.3	)	$	(613.3	)

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

Pre-tax amounts recorded in accumulated other comprehensive income (loss) (AOCI), not yet recognized in net periodic benefit cost (credit) as of December 31, 2018 and 2017, consists of:



	Pension Benefits						OPEB
	December 31,						December 31,
	2018			2017			2018		2017
	(in millions)
Net actuarial gain (loss)	$	(230.6	)	$	(237.4	)	$	31.3	$	(13.5	)
Net prior service credit (cost)	(1.2		)	(0.1		)	6.2		7.2
Total amounts recorded	$	(231.8	)	$	(237.5	)	$	37.5	$	(6.3	)

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic benefit cost (credit) are as follows:



	Pension Benefits									OPEB
	2018			2017			2016			2018			2017			2016
	(in millions)
Service cost	$	2.6		$	3.6		$	2.9		$	0.4		$	0.3		$	0.3
Interest cost	27.3			28.9			28.8			12.4			13.3			14.0
Expected asset return	(45.8		)	(44.0		)	(42.1		)	—			—			—
Amortized actuarial loss	7.8			7.1			5.5			0.8			0.6			0.5
Amortized prior service credit	0.1			(0.1		)	(0.1		)	(2.7		)	(2.7		)	(2.7		)
Curtailment loss (gain)	3.2			—			—			(0.6		)	—			—
Settlement charge	0.4			3.2			—			—			—			—
Net periodic benefit cost (credit)	$	(4.4	)	$	(1.3	)	$	(5.0	)	$	10.3		$	11.5		$	12.1

Schedule of Allocation of Plan Assets [Table Text Block]



	U.S.					U.K.
					Target					Target
	2018		2017		Allocation	2018		2017		Allocation
Equity securities	31.9	%	42.7	%	30% - 55%	19.0	%	28.6	%	25% - 35%
Fixed income securities	57.5		47.5		40% - 60%	68.3		57.9		55% - 65%
Alternative assets	10.0		8.2		5% - 10%	10.5		11.2		5% - 15%
Cash	0.6		1.6		0% - 5%	2.2		2.3		0% - 5%
Total	100.0	%	100.0	%		100.0	%	100.0	%

The primary objective of our pension plan assets is to provide a source of retirement income for participants and beneficiaries. Our primary financial objectives for the pension plan assets have been established in conjunction with a comprehensive review of our current and projected financial requirements. These objectives include having the ability to pay all future benefits and expenses when due, maintaining flexibility and minimizing volatility. These objectives are based on a long-term investment horizon.

Defined Benefit Pension Plan Assets Investments in our defined benefit plans are stated at fair value. Level 1 assets are valued using quoted market prices that represent the asset value of the shares held by the trusts. The level 2 assets are investments in pooled funds, which are valued using a model to reflect the valuation of their underlying assets that are publicly traded with observable values. The fair values of our pension plan assets are as follows:



December 31, 2018
Asset Categories	Level 1		Level 2		Level 3		Total
	(in millions)
Cash and Cash Equivalents	$	3.5	$	3.2	$	—	$	6.7
Equity
U.S. Large Cap	72.5		3.4		—		75.9
U.S. Small/Mid Cap	17.4		0.1		—		17.5
World Equity	79.5		5.3		—		84.8
Fixed Income Securities
Government & Agencies	86.5		54.3		—		140.8
Corporate Bonds - Investment Grade	177.2		2.7		—		179.9
Corporate Bonds - Non-investment Grade	19.8		1.5		—		21.3
Emerging Market Debt	18.0		0.9		—		18.9
Other	6.9		8.9		—		15.8
Other
Property Funds ^(a)	—		—		—		56.0
Liquid Alternatives Fund ^(a)	—		—		—		2.5
Structured Credit Fund ^(a)	—		—		—		5.7
Multi Strategy Hedge Fund ^(a)	—		—		—		—
Total Plan Assets	$	481.3	$	80.3	$	—	$	625.8

December 31, 2017
Asset Categories	Level 1		Level 2		Level 3		Total
	(in millions)
Cash and Cash Equivalents	$	10.1	$	2.8	$	—	$	12.9
Equity
U.S. Large Cap	92.0		6.3		—		98.3
U.S. Small/Mid Cap	44.0		1.2		—		45.2
World Equity	123.5		6.2		—		129.7
Fixed Income Securities
Government & Agencies	81.3		46.4		—		127.7
Corporate Bonds - Investment Grade	150.5		4.2		—		154.7
Corporate Bonds - Non-investment Grade	24.8		1.8		—		26.6
Emerging Market Debt	25.2		1.2		—		26.4
Other	8.7		8.1		—		16.8
Other
Property Funds ^(a)	—		—		—		52.4
Liquid Alternatives Fund ^(a)	—		—		—		4.6
Structured Credit Fund ^(a)	—		—		—		6.0
Multi Strategy Hedge Fund ^(a)	—		—		—		0.9
Total Plan Assets	$	560.1	$	78.2	$	—	$	702.2

(a) In accordance with ASC 810-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Consolidated Balance Sheets.