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BENEFIT PLANS: (Tables)

12 Months Ended

Dec. 31, 2018

Post retirement defined benefit plans and defined contribution plan

Components of net periodic benefit costs

Schedule of the components of net periodic benefit costs

		Years ended
		December 31,
(in millions)		2018			2017			2016
Service cost		$	1.0		$	0.8		$	0.7
Interest cost			1.6			1.4			1.0
Expected return on plan assets			(3.4)			(2.9)			(2.2)
Amortization of prior service cost / (credit)			0.2			0.1			0.1
Settlement / Curtailment			(0.2)			0.1			(0.2)
Amortization of net loss/(gain)			0.2			0.2			0.2
Net periodic benefit cost		$	(0.6)		$	(0.3)		$	(0.4)

Schedule of changes in the benefit obligation and plan assets, the funded status of the plans and the amount recognized in balance sheet and accumulated other comprehensive income

		As of December 31,
(in millions)		2018			2017
Change in benefit obligation:
Projected benefit obligation at beginning of year		$	27.5		$	25.6
Service cost			1.0			0.8
Interest cost			1.6			1.4
Settlement			—			0.9
Benefits paid			(1.6)			(1.9)
Actuarial (gain)/loss			(0.2)			(0.3)
Actuarial gain assumption changes			(0.8)			0.3
Inflation adjustment			(0.1)			0.7
Projected benefit obligation at end of year		$	27.4		$	27.5
Change in plan assets:
Fair value of plan assets at beginning of year		$	51.6		$	44.6
Actual return on plan assets			(3.5)			6.9
Employer contributions			(0.4)			(0.4)
Benefits paid			(1.0)			(0.9)
Currency exchange rate adjustment			—			1.4
Fair value of plan assets at end of year		$	46.7		$	51.6
Funded status at end of year:		$	19.3		$	24.1
ASC-715 amounts recognized in statement of financial position consists of:
Non-current assets		$	19.4		$	24.2
Total		$	19.4		$	24.2
ASC-715 amounts recognized in accumulated other comprehensive income (net of income taxes of $(4.3) million and $(2.0) million in 2018 and 2017, respectively) consists of:
Net loss (gain)		$	5.8		$	2.3
Prior service cost			1.4			1.5
Total		$	7.2		$	3.8

Schedule of changes in accumulated other comprehensive income

(in millions)		2018			2017
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year		$	3.8		$	5.8
Net loss/(gain) amortized during the year			3.6			(0.1)
Net loss/(gain) occurring during the year			(0.1)			(2.4)
Prior service cost (credit)			—			0.4
Currency exchange rate adjustment			(0.1)			0.1
Net adjustment to accumulated other comprehensive income (net of income taxes of $(2.2) million and $1.3 million in 2018 and 2017, respectively)			3.4			(2.0)
Accumulated other comprehensive income at end of plan year		$	7.2		$	3.8

Summary of the amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of tax

(in millions)		2018			2017
Net loss / (gain)		$	3.6		$	(2.4)
Amortization of net (loss) gain			(0.1)			(0.1)
Amortization of prior services cost (credit)			—			0.4
Total amortization expenses		$	3.5		$	(2.1)

Scheduled maturities of the benefits expected to be paid in each of the next five years, and thereafter

		Expected
Years		Benefit Payments
		(in millions)
2019		$	2.6
2020			1.7
2021			1.8
2022			1.9
2023			2.0
2024 to 2026			13.4
Total		$	23.4

Post-retirement Health care plans

Components of net periodic benefit costs

Schedule of the components of net periodic benefit costs

		Years ended December 31,
(in millions)		2018			2017			2016
Interest cost		$	0.9		$	0.9		$	0.6
Amortization of prior service cost/ (credit)			(0.2)			(0.2)			(0.5)
Net periodic benefit cost		$	0.7		$	0.7		$	0.1

Schedule of changes in the benefit obligation and plan assets, the funded status of the plans and the amount recognized in balance sheet and accumulated other comprehensive income

		As of December 31,
(in millions)		2018			2017
Change in benefit obligation:
Projected benefit obligation at beginning of year		$	12.5		$	12.9
Interest cost			0.9			0.9
Actuarial loss/ (gain)-claims cost			0.2			(0.4)
Benefits paid			(0.9)			(0.9)
Actuarial (gain)/loss			(0.9)			(0.6)
Inflation adjustment			0.1			0.6
Projected benefit obligation at end of year		$	11.9		$	12.5
Change in plan assets:
Fair value of plan assets at beginning of year		$	—		$	—
Employer contributions			0.1			0.1
Benefits paid			(0.1)			(0.1)
Fair value of plan assets at end of year		$	—		$	—
Funded status at end of year:		$	11.9		$	12.5
ASC-715 amounts recognized in statement of financial position consists of:
Current liabilities		$	(0.1)		$	(0.1)
Non-current liabilities			(11.8)			(12.5)
Total		$	(11.9)		$	(12.6)
ASC-715 amounts recognized in accumulated other comprehensive income consists of:
Net loss (gain)		$	(4.4)		$	(3.9)
Total (net of income taxes of $1.9 million and $1.7 million in 2018 and 2017, respectively)		$	(4.4)		$	(3.9)

Schedule of changes in accumulated other comprehensive income

		As of December 31,
(in millions)		2018			2017
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year		$	(3.9)		$	(2.8)
Net loss/(gain) occurring during the year			(0.6)			(0.6)
Net loss/(gain) amortized during the year			0.1			0.1
Currency exchange rate adjustment			—			(0.6)
Net adjustment to accumulated other comprehensive income (net of income taxes of $0.2 million and $0.3 million in 2018 and 2017, respectively)			(0.5)			(1.1)
Accumulated other comprehensive income at end of plan year		$	(4.4)		$	(3.9)

Summary of the amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of tax

		At December 31,
(in millions)		2018			2017
Net loss / (gain)		$	(0.6)		$	(0.6)
Amortization of net (loss) gain			0.2			0.1
Total amortization expenses		$	(0.4)		$	(0.5)

Schedule of assumptions used to determine the pension obligations and other post-retirement benefits

		2018		2017		2016
Expatriate health plan
Discount rate		3.90	%	3.25	%	3.65	%
Mexican health plan
Weighted average discount rate		8.45	%	7.80	%	7.55	%

Scheduled maturities of the benefits expected to be paid in each of the next five years, and thereafter

		Expected
Year		Benefit Payments
		(in millions)
2019		$	0.9
2020			0.9
2021			0.9
2022			0.9
2023			0.9
2024 to 2028			2.9
Total		$	7.4

Expatriate Plan | Post retirement defined benefit plans and defined contribution plan

Components of net periodic benefit costs

Schedule of assumptions used to determine the pension obligations and other post-retirement benefits

Expatriate Plan		2018		2017		2016
Discount rate		3.90	%	3.25	%	3.65	%
Expected long-term rate of return on plan asset		4.00	%	4.00	%	4.00	%
Rate of increase in future compensation level		N/A		N/A		N/A

Mexican Health Plan | Post retirement defined benefit plans and defined contribution plan

Components of net periodic benefit costs

Schedule of asset mix of the investment portfolio

		2018		2017
Asset category:
Treasury bills		78	%	70	%
Equity securities		22	%	30	%
		100	%	100	%

Mexican Health Plan | Post-retirement Health care plans

Components of net periodic benefit costs

Schedule of assumptions used to determine the pension obligations and other post-retirement benefits

Mexican Plan(*)		2018		2017		2016
Discount rate		8.45	%	7.80	%	7.55	%
Expected long-term rate of return on plan asset		8.45	%	7.55	%	7.55	%
Rate of increase in future compensation level		4.50	%	4.50	%	4.50	%

(*)   These rates are based on Mexican pesos as pension obligations are denominated in pesos.

Schedule of effects of one percentage-point change in assumed other benefits cost trend rates

		One Percentage
		Point
(in millions)		Increase			Decrease
Effect on total service and interest cost components		$	1.0		$	0.8
Effect on the post-retirement benefit obligation		$	11.7		$	10.5

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