Pension Plans (Tables)

12 Months Ended

Dec. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of the Funded Status of the Non-U.S. Plans

The following sets forth the funded status of our plans as of the most recent actuarial valuations using measurement dates of December 31 ($ in millions):

	U.S. Pension Benefits			Non-U.S. Pension Benefits
	2017			2017			2016
Change in pension benefit obligation:
Benefit obligation at beginning of year	$	—		$	335.4		$	326.9
Service cost	—			4.0			3.5
Interest cost	0.3			5.9			7.4
Employee contributions	—			1.5			1.5
Benefits paid and other	(0.2		)	(11.1		)	(12.8		)
Plan combinations/acquisitions	33.1			1.5			2.8
Actuarial loss (gain)	0.5			(10.7		)	32.2
Amendments, settlements and curtailments	—			(17.6		)	(1.6		)
Foreign exchange rate impact	—			36.0			(24.5		)
Benefit obligation at end of year	33.7			344.9			335.4
Change in plan assets:
Fair value of plan assets at beginning of year	—			198.1			196.7
Actual return on plan assets	0.5			(9.4		)	17.9
Employer contributions	—			10.6			10.7
Employee contributions	—			1.5			1.5
Amendments and settlements	—			(5.1		)	(0.5		)
Benefits paid and other	(0.2		)	(11.1		)	(12.8		)
Plan combinations/acquisitions	25.5			0.9			1.8
Foreign exchange rate impact	—			19.7			(17.2		)
Fair value of plan assets at end of year	25.8			205.2			198.1
Funded status	$	(7.9	)	$	(139.7	)	$	(137.3	)

Schedule of Weighted Average Assumptions Used

Weighted average assumptions used to determine net periodic pension cost at date of measurement

	U.S. Pension Plans		Non-U.S. Pension Plans
	2017		2017		2016
Discount rate	3.83	%	1.91	%	2.63	%
Expected return on plan assets	5.75	%	3.58	%	4.19	%
Rate of compensation increase	N/A		2.89	%	2.77	%

Weighted average assumptions used to determine benefit obligations at date of measurement

	U.S. Pension Plans		Non-U.S. Pension Plans
	2017		2017		2016
Discount rate	3.73	%	1.96	%	1.91	%
Rate of compensation increase	N/A		2.31	%	2.89	%

Schedule of Net Periodic Pension Costs

Components of net periodic pension cost

	U.S. Pension Benefits			Non-U.S. Pension Benefits
($ in millions)	2017			2017			2016
Service cost	$	—		$	4.0		$	3.5
Interest cost	0.3			5.9			7.4
Expected return on plan assets	(0.3		)	(7.4		)	(8.1		)
Amortization of net loss	—			4.6			5.3
Net curtailment and settlement loss recognized	—			0.9			0.2
Net periodic pension cost	$	—		$	8.0		$	8.3

Schedule of Fair Value of Pension Plan Assets

The fair values of our pension plan assets as of December 31, 2017, by asset category were as follows ($ in millions):

	Quoted Prices in Active Market (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Cash and equivalents	$	5.6	$	—	$	—	$	5.6
Fixed income securities:
Corporate bonds	—		0.3		—		0.3
Mutual funds	—		9.7		—		9.7
Insurance contracts	—		1.8		—		1.8
Total	$	5.6	$	11.8	$	—	$	17.4
Investments measured at NAV(a):
Mutual funds							211.7
Other private investments							1.9
Total assets at fair value							$	231.0
(a) The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the total fair value of plan assets.

The fair values of our pension plan assets as of December 31, 2016, by asset category were as follows ($ in millions):

	Quoted Prices in Active Market (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Cash and equivalents	$	4.4	$	—	$	—	$	4.4
Fixed income securities:
Corporate bonds	—		0.3		—		0.3
Mutual funds	—		7.7		—		7.7
Insurance contracts	—		1.4		—		1.4
Total	$	4.4	$	9.4	$	—	$	13.8
Investments measured at NAV(a):
Mutual funds							179.8
Other private investments							4.5
Total assets at fair value							$	198.1
(a) The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the total fair value of plan assets.

Schedule of Expected Benefit Payments

The following sets forth benefit payments to participants, which reflect expected future service, as appropriate, expected to be paid by the plans in the periods indicated ($ in millions):

	U.S. Pension Plans		Non-U.S. Pension Plans		All Pension Plans
2018	$	1.1	$	13.2	$	14.3
2019	1.3		13.1		14.4
2020	1.3		14.0		15.3
2021	1.5		13.9		15.4
2022	1.6		15.7		17.3
2023-2027	9.0		73.5		82.5