Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Defined Benefit Plan Disclosure [Line Items]

Schedule of components of period benefit costs

The components of period benefit costs for the years ended December 31, 2017, 2016 and 2015 are as follows:

	US Pension Plans									Non-US Pension Plans									Postretirement Health and Other
(in millions)	2017			2016			2015			2017			2016			2015			2017			2016			2015
Service cost - benefits earned    during the year	$	—		$	—		$	—		$	1.9		$	1.7		$	2.6		$	0.3		$	0.3		$	0.4
Interest cost of projected    benefit obligation		5.3			6.8			9.4			2.1			2.5			8.9			1.0			1.7			2.0
Expected return on assets		(4.9	)		(5.7	)		(9.0	)		(1.5	)		(1.8	)		(7.4	)		—			—			—
Amortization of prior service    cost		—			—			—			0.1			0.1			0.1			(1.4	)		—			—
Amortization of actuarial net    loss (gain)		3.2			3.6			5.1			1.6			1.0			2.3			0.4			—			0.1
Curtailment gain recognized		—			—			—			—			—			—			—			—			—
Net periodic benefit cost	$	3.6		$	4.7		$	5.5		$	4.2		$	3.5		$	6.5		$	0.3		$	2.0		$	2.5
Weighted average    assumptions:
Discount rate		4.2	%		4.5	%		4.1	%		2.1	%		2.9	%		3.3	%		3.8	%		4.2	%		3.7	%
Expected return on plan assets		4.7	%		5.5	%		5.8	%		3.4	%		4.0	%		3.6	%	N/A			N/A			N/A
Rate of compensation    increase	N/A			N/A			N/A				2.6	%		2.4	%		3.9	%	N/A			N/A				1.5	%

Reconciliation of the Changes in Benefit Obligation, the Changes in Plan Assets, and the Funded Status

The following is a reconciliation of the changes in benefit obligation, the changes in plan assets, and the funded status as of December 31, 2017 and 2016:

	US Pension Plans						Non-US Pension Plans						Postretirement Medical and Other
(in millions)	2017			2016			2017			2016			2017			2016
Change in Benefit Obligation
Benefit obligation, beginning of year	$	155.6		$	218.5		$	82.8		$	252.5		$	41.6		$	51.8
Distribution of MFS		—			(62.4	)		—			(170.4	)		—			(10.1	)
Service cost		—			—			1.9			1.7			0.3			0.3
Interest cost		5.3			6.8			2.1			2.5			1.0			1.7
Participant contributions		—			—			—			—			1.4			1.9
Medicare subsidies received		—			—			—			—			—			0.2
Plan amendments		—			—			—			—			(13.8	)		—
Net transfer out		—			—			—			—			—			—
Actuarial (gain) loss		10.0			0.9			(2.2	)		11.0			2.9			1.8
Currency translation adjustment		—			—			9.2			(9.9	)		—			—
Benefits paid		(8.6	)		(8.2	)		(4.3	)		(4.6	)		(4.5	)		(6.0	)
Benefit obligation, end of year	$	162.3		$	155.6		$	89.5		$	82.8		$	28.9		$	41.6
Change in Plan Assets
Fair value of plan assets, beginning of year	$	108.6		$	143.9		$	41.8		$	196.9		$	—		$	—
Distribution of MFS		—			(34.1	)		—			(147.8	)		—			—
Actual return on plan assets		11.5			6.4			1.1			2.7			—			—
Employer contributions		4.7			0.6			2.1			2.2			3.1			3.9
Participant contributions		—			—			—			—			1.4			1.9
Medicare subsidies received		—			—			—			—			—			0.2
Currency translation adjustment		—			—			4.4			(7.6	)		—			—
Net transfer out		—			—			—			—			—			—
Benefits paid		(8.6	)		(8.2	)		(4.3	)		(4.6	)		(4.5	)		(6.0	)
Fair value of plan assets, end of year		116.2			108.6			45.1			41.8			—			—
Funded status	$	(46.1	)	$	(47.0	)	$	(44.4	)	$	(41.0	)	$	(28.9	)	$	(41.6	)
Amounts recognized in the Consolidated    Balance sheet at December 31
Pension asset	$	—		$	—		$	—		$	—		$	—		$	—
Pension obligation		(46.1	)		(47.0	)		(44.4	)		(41.0	)		—			—
Postretirement medical and other benefit    obligations		—			—			—			—			(28.9	)		(41.6	)
Net amount recognized	$	(46.1	)	$	(47.0	)	$	(44.4	)	$	(41.0	)	$	(28.9	)	$	(41.6	)
Weighted-Average Assumptions
Discount rate		3.6	%		4.2	%		2.2	%		2.1	%		3.3	%		3.8	%
Expected return on plan assets		4.7	%		5.5	%		3.4	%		4.0	%	N/A			N/A
Rate of compensation increase	N/A			N/A				2.6	%		2.4	%	N/A			N/A

Amounts Recognized in Accumulated Other Comprehensive Income

Amounts recognized in accumulated other comprehensive income as of December 31, 2017 and 2016, consist of the following:

	Pensions						Postretirement Medical and Other
(in millions)	2017			2016			2017			2016
Net actuarial gain (loss)	$	(64.2	)	$	(65.1	)	$	(7.6	)	$	(5.1	)
Prior service credit		(0.6	)		(0.6	)		12.5			—
Total amount recognized	$	(64.8	)	$	(65.7	)	$	4.9		$	(5.1	)

Summary of the Sensitivity of Retirement Obligations and Retirement Benefit Costs of Plans to Changes in the Key Assumptions

The following table summarizes the sensitivity of our December 31, 2017 retirement obligations and 2017 retirement benefit costs of our plans to changes in the key assumptions used to determine those results (in millions):

Change in assumption:	Estimated increase (decrease) in 2018 pension cost			Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2017			Estimated increase (decrease) in 2018 Other Postretirement Benefit costs			Estimated increase (decrease) in Other Postretirement Benefit Obligation for the year ended December 31, 2017
0.50% increase in discount rate	$	(0.9	)	$	(15.0	)	$	(0.1	)	$	(0.9	)
0.50% decrease in discount rate		0.9			16.2			0.1			0.9
0.50% increase in long-term return on assets		(0.8	)	N/A			N/A			N/A
0.50% decrease in long-term return on assets		0.8		N/A			N/A			N/A
1% increase in medical trend rates	N/A			N/A				0.3			1.4
1% decrease in medical trend rates	N/A			N/A				(0.3	)		(1.3	)

Schedule of the Actual Allocations for the Pension Assets and Target Allocations by Asset Class

The actual allocations for the pension assets at December 31, 2017, and target allocations by asset class, are as follows:

	Target Allocations				Weighted Average Asset Allocations
	U.S. Plans			International Plans	U.S. Plans			International Plans
Equity Securities		50	%	0 - 25%		48.0	%		35.6	%
Debt Securities		50	%	0 - 100%		48.3	%		31.6	%
Other		—	%	0 - 100%		3.7	%		32.8	%

Schedule of Plan Assets Using the Fair Value Hierarchy

The following table presents our plan assets using the fair value hierarchy as of December 31, 2017 and 2016.  The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant other observable inputs, and Level 3 includes fair values estimated using significant non-observable inputs.

	December 31, 2017
Assets (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Net Asset Value ("NAV")		Total
Cash	$	4.7	$	—	$	—	$	—	$	4.7
Insurance group annuity contracts		—		—		14.4		—		14.4
Common/collective trust funds — Government, corporate and other non-government debt		—		—		—		70.4		70.4
Common/collective trust funds — Corporate equity		—		—		—		71.8		71.8
Total	$	4.7	$	—	$	14.4	$	142.2	$	161.3

	December 31, 2016
Assets (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Net Asset Value ("NAV")		Total
Cash	$	0.9	$	—	$	—	$	—	$	0.9
Insurance group annuity contracts		—		—		14.5		—		14.5
Common/collective trust funds — Government, corporate and other non-government debt		—		—		—		93.7		—
Common/collective trust funds — Corporate equity		—		—		—		41.3		—
Total	$	0.9	$	—	$	14.5	$	135.0	$	150.4

Reconciliation of the Fair Values Measurements of Plan Assets Using Significant Unobservable Inputs (Level 3) from the Beginning of the Year to the End of the Year

A reconciliation of the fair values measurements of plan assets using significant unobservable inputs (Level 3) from the beginning of the year to the end of the year is as follows:

	Insurance Contracts Year Ended December 31,
(in millions)	2017			2016
Beginning Balance	$	14.5		$	106.5
Distribution of MFS		—			(89.9	)
Actual return on assets		—			2.0
Benefit payments		(1.5	)		(1.4	)
Foreign currency impact		1.3			(2.7	)
Ending Balance	$	14.4		$	14.5

Schedule of Projected Benefit Payments from the Plans

Projected benefit payments from the plans as of December 31, 2017 are estimated as follows:

(in millions)	U.S Pension Plans		Non-U.S. Pension Plans		Postretirement Health and Other
2018	$	9.8	$	2.9	$	3.5
2019		10.0		3.1		3.4
2020		10.2		3.4		3.2
2021		10.2		3.7		3.1
2022		10.1		3.8		2.6
2023 — 2027		49.7		21.3		10.1

Schedule of Fair Value of Plan Assets for which the Accumulated Benefit Obligation is in Excess of Plan Assets

The fair value of plan assets for which the accumulated benefit obligation is in excess of the plan assets as of December 31, 2017 and 2016 is as follows:

	U.S Pension Plans				Non U.S. Pension Plans
(in millions)	2017		2016		2017		2016
Projected benefit obligation	$	162.3	$	155.6	$	85.6	$	79.1
Accumulated benefit obligation		162.3		155.6		82.1		76.2
Fair value of plan assets		116.2		108.6		41.6		38.4

U.S. Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of the Weighted-Average Asset Allocations of the Pension Plans

The weighted-average asset allocations of the U.S. pension plans at December 31, 2017 and 2016, by asset category are as follows:

	2017			2016
Equity		48.0	%		25.0	%
Fixed income		48.3	%		74.4	%
Other		3.7	%		0.6	%
		100.0	%		100.0	%

Non-US Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of the Weighted-Average Asset Allocations of the Pension Plans

The weighted-average asset allocations of the Non-U.S. pension plans at December 31, 2017 and 2016, by asset category are as follows:

	2017			2016
Equity		35.6	%		33.7	%
Fixed income		31.6	%		31.1	%
Other		32.8	%		35.2	%
		100.0	%		100.0	%