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Employee plans (Tables)

12 Months Ended

Dec. 31, 2021

Defined Benefit Plan Disclosure [Line Items]

Schedule of Restricted Stock Unit Activity

A summary of restricted stock and restricted stock unit (RSU) activity for the year ended December 31, 2021 follows (shares in thousands):

						Restricted Stock and RSU’s						Weighted-Average Grant-Date Fair Value
Outstanding at December 31, 2020						1,726						$	17.87
Granted						1,590						25.38
Vested						(923)						16.60
Forfeited and expired						(269)						19.02
Outstanding at December 31, 2021						2,124						22.73

Schedule of Weighted-Average Assumptions

The fair value of awards with market conditions is estimated using a Monte Carlo simulation with the following weighted-average assumptions.

Year ended December 31,						2021						2020
Weighted-average fair value of grant						$	40.02					$	28.33
Risk-free interest rate(i)						0.27		%				1.35		%
Expected volatility(ii)						57.08		%				51.81		%
Expected life of restricted stock units in years(iii)						2.84						2.86
Expected dividend yield						—		%				—		%

(i)			Represents the continuously compounded semi-annual zero-coupon U.S. treasury rate commensurate with the remaining performance period
(ii)			Based on historical volatility for the company that is commensurate with the length of the performance period
(iii)			Represents the remaining life of the longest performance period

Schedule of Accumulated Benefit Obligation in Excess of Plan Assets

Information for defined benefit retirement plans with an accumulated benefit obligation in excess of plan assets follows:

As of December 31,						2021						2020
Accumulated benefit obligation						$	4,498.8					$	6,060.7
Fair value of plan assets						$	3,587.7					$	4,839.5

Schedule of Projected Benefit Obligation in Excess of Plan Assets

Information for defined benefit retirement plans with a projected benefit obligation in excess of plan assets follows:

As of December 31,						2021						2020
Projected benefit obligation						$	4,500.5					$	6,063.0
Fair value of plan assets						$	3,587.7					$	4,839.5

Schedule of Assumed Health Care Cost Trend Rates

Assumed health care cost trend rates at December 31,						2021						2020
Health care cost trend rate assumed for next year						6.5		%				5.4		%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)						4.5		%				4.5		%
Year that the rate reaches the ultimate trend rate						2033						2025

Schedule of Plan Assets (Liabilities) at Fair Value

The following table sets forth by level, within the fair value hierarchy, the plans’ assets (liabilities) at fair value at December 31, 2021.

						U.S. Plans																								International Plans
As of December 31, 2021						Fair Value						Level 1						Level 2						Level 3						Fair Value						Level 1						Level 2						Level 3
Pension plans
Equity Securities
Common Stocks						$	654.3					$	652.4					$	1.9					$	—					$	—					$	—					$	—					$	—
Commingled Funds						398.9												398.9												34.1												34.1
Debt Securities
U.S. Govt. Securities						413.2						413.2
Other Fixed Income						479.3												479.3												3.0												3.0
Insurance Contracts																														110.2																		110.2
Commingled Funds						525.2												525.2												383.8												383.8
Real Estate
Real Estate Investment Trusts						154.1						154.1
Other
Derivatives(i)						(53.7)						5.8						(59.5)
Commingled Funds																														390.0												390.0
Pooled Funds						108.4												108.4
Cumulative futures contracts variation margin paid to brokers						(5.8)						(5.8)
Cash						0.2						0.2																		28.7						28.7
Receivables						15.7						15.7
Payables						(1.1)						(1.1)
Total plan assets in fair value hierarchy						$	2,688.7					$	1,234.5					$	1,454.2					$	—					$	949.8					$	28.7					$	810.9					$	110.2
Plan assets measured using NAV as a practical expedient(ii):
Commingled Funds
Equity						$	—																							$	404.5
Debt						78.6																								1,077.3
Other						112.5
Private Real Estate						234.2
Private Equity						25.3
Total pension plan assets						$	3,139.3																							$	2,431.6
Other postretirement plans
Insurance Contracts						$	5.6																	$	5.6

(i) Level 1 derivatives represent unrealized appreciation or depreciation on open futures contracts. The value of open futures contracts includes derivatives and the cumulative futures contracts variation margin paid to or received from brokers.

(ii) Investments measured at fair value using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.

The following table sets forth by level, within the fair value hierarchy, the plans’ assets (liabilities) at fair value at December 31, 2020.

						U.S. Plans																								International Plans
As of December 31, 2020						Fair Value						Level 1						Level 2						Level 3						Fair Value						Level 1						Level 2						Level 3
Pension plans
Equity Securities
Common Stocks						$	774.1					$	771.2					$	2.9					$	—					$	—					$	—					$	—					$	—
Commingled Funds						640.6												640.6												153.4												153.4
Debt Securities
U.S. Govt. Securities						388.5						388.5
Other Fixed Income						589.9												589.9												125.8												125.8
Insurance Contracts																														127.5																		127.5
Commingled Funds						689.9												689.9												471.2												471.2
Real Estate
Real Estate Investment Trusts						112.1						112.1																		2.0												2.0
Other
Derivatives(i)						(67.3)						5.0						(72.3)												20.5												20.5
Commingled Funds																														381.4												381.4
Pooled Funds						233.4												233.4												178.0												178.0
Cumulative futures contracts variation margin received from brokers						(1.1)						(1.1)
Cash						21.8						21.8																		111.7						111.7
Receivables						28.8						28.8																		2.1						2.1
Payables						(7.3)						(7.3)																		(20.7)						(20.7)
Total plan assets in fair value hierarchy						$	3,403.4					$	1,319.0					$	2,084.4					$	—					$	1,552.9					$	93.1					$	1,332.3					$	127.5
Plan assets measured using NAV as a practical expedient(ii):
Commingled Funds
Equity						$	—																							$	429.9
Debt						121.7																								1,067.4
Other						104.2																								27.4
Private Real Estate						208.0																								51.8
Private Equity						10.5
Total pension plan assets						$	3,847.8																							$	3,129.4
Other postretirement plans
Insurance Contracts						$	6.0																	$	6.0

(i) Level 1 derivatives represent unrealized appreciation or depreciation on open futures contracts. The value of open futures contracts includes derivatives and the cumulative futures contracts variation margin received from brokers.

(ii) Investments measured at fair value using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.

Schedule of Changes in Fair Value of Plans Assets

The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the year ended December 31, 2021.

						January 1, 2021						Realized gains (losses)						Purchases or acquisitions						Sales or dispositions						Currency and unrealized gains (losses) relating to instruments still held at December 31, 2021						December 31, 2021
U.S. plans
Other postretirement plans
Insurance Contracts						$	6.0					$	(0.1)					$	—					$	(0.3)					$	—					$	5.6
International pension plans
Insurance Contracts						$	127.5					$	—					$	36.1					$	(48.7)					$	(4.7)					$	110.2

The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the year ended December 31, 2020.

						January 1, 2020						Realized gains (losses)						Purchases or acquisitions						Sales or dispositions						Currency and unrealized gains (losses) relating to instruments still held at December 31, 2020						December 31, 2020
U.S. plans
Other postretirement plans
Insurance Contracts						$	6.9					$	(0.4)					$	—					$	(0.5)					$	—					$	6.0
International pension plans
Insurance Contracts						$	123.1					$	—					$	4.1					$	(11.5)					$	11.8					$	127.5

Schedule of Additional Information about Plan Assets Valued Using Net Asset Value

The following table presents additional information about plan assets valued using the net asset value as a practical expedient within the fair value hierarchy table.

						2021																								2020
						Fair Value						Unfunded Commit-ments						Redemption Frequency						Redemption Notice Period Range						Fair Value						Unfunded Commit-ments						Redemption Frequency						Redemption Notice Period Range
U.S. plans
Commingled Funds
Debt						$	78.6					$	—					Monthly						45 days						$	121.7					$	—					Monthly						45 days
Other						112.5						—						Monthly						5 days						104.2						—						Monthly						5 days
Private Real Estate(i)						234.2						—						Quarterly						60-90 days						208.0						15.7						Quarterly						60-90 days
Private Equity(ii)						25.3						28.6																		10.5						20.9
Total						$	450.6					$	28.6																	$	444.4					$	36.6
International pension plans
Commingled Funds
Equity						$	404.5					$	—					Weekly						Up to 2 days						$	429.9					$	—					Weekly						Up to 2 days
Debt						1,077.3						138.9						Weekly, Monthly, Quarterly						Up to 120 days						1,067.4						86.2						Weekly, Bimonthly, Monthly, Quarterly						Up to 120 days
Other						—						—																		27.4						—						Monthly						Up to 30 days
Private Real Estate						—						—																		51.8						—						Monthly						Up to 90 days
Total						$	1,481.8					$	138.9																	$	1,576.5					$	86.2

(i) Includes investments in private real estate funds. The funds invest in U.S. real estate and allow redemptions quarterly, though queues, restrictions and gates may extend the period. A redemption has been requested from one fund, which has a redemption queue with estimates of full receipt of three to four years.

(ii) Includes investments in limited partnerships, which invest primarily in secondary markets and private credit. The investments can never be redeemed.

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Weighted-Average Assumptions

Weighted-average assumptions used to determine net periodic pension cost were as follows:

						U.S. Plans																		International Plans
Year ended December 31,						2021						2020						2019						2021						2020						2019
Discount rate						2.85		%				3.53		%				4.50		%				1.23		%				1.82		%				2.55		%
Expected long-term rate of return on assets						6.07		%				6.50		%				6.80		%				3.30		%				3.50		%				4.18		%
Weighted-average assumptions used to determine benefit obligations at December 31 were as follows:
Discount rate						3.18		%				2.85		%				3.53		%				1.73		%				1.23		%				1.82		%

Schedule of Funded Status of Plan and Amounts Recognized in Consolidated Balance Sheet

Retirement plans’ funded status and amounts recognized in the company’s consolidated balance sheets follows:

						U.S. Plans												International Plans
As of December 31,						2021						2020						2021						2020
Change in projected benefit obligation
Benefit obligation at beginning of year						$	4,545.3					$	4,755.6					$	3,468.0					$	3,143.8
Service cost						—						—						3.0						2.8
Interest cost						117.6						162.5						36.7						53.4
Plan participants’ contributions						—						—						1.0						1.1
Plan curtailment						—						—						—						(1.6)
Plan settlement						(513.8)						(277.3)						(726.8)						—
Actuarial loss						(108.4)						253.9						2.0						226.5
Benefits paid						(331.1)						(349.4)						(106.5)						(119.0)
Foreign currency translation adjustments						—						—						(63.0)						161.0
Benefit obligation at end of year						$	3,709.6					$	4,545.3					$	2,614.4					$	3,468.0
Change in plan assets
Fair value of plan assets at beginning of year						$	3,847.8					$	3,334.2					$	3,129.4					$	2,816.4
Actual return on plan assets						130.4						347.2						134.0						254.7
Employer contribution						6.0						793.1						46.4						33.1
Plan participants’ contributions						—						—						1.0						1.1
Plan settlement						(513.8)						(277.3)						(726.8)						—
Benefits paid						(331.1)						(349.4)						(106.5)						(119.0)
Foreign currency translation adjustments						—						—						(45.9)						143.1
Fair value of plan assets at end of year						$	3,139.3					$	3,847.8					$	2,431.6					$	3,129.4
Funded status at end of year						$	(570.3)					$	(697.5)					$	(182.8)					$	(338.6)
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets						$	33.9					$	27.2					$	125.8					$	160.3
Other accrued liabilities						(5.9)						(6.1)						(0.1)						(0.2)
Long-term postretirement liabilities						(598.3)						(718.6)						(308.5)						(498.7)
Total funded status						$	(570.3)					$	(697.5)					$	(182.8)					$	(338.6)
Accumulated other comprehensive loss, net of tax
Net loss						$	2,047.6					$	2,510.4					$	797.6					$	1,116.9
Prior service credit						$	(29.7)					$	(32.3)					$	(40.2)					$	(45.9)
Accumulated benefit obligation						$	3,709.6					$	4,545.3					$	2,612.7					$	3,360.4

Schedule of Components of Net Periodic Cost (Income)

Net periodic pension cost (income) includes the following components:

						U.S. Plans																		International Plans
Year ended December 31,						2021						2020						2019						2021						2020						2019
Service cost(i)						$	—					$	—					$	—					$	3.0					$	2.8					$	2.8
Interest cost						117.6						162.5						197.5						36.7						53.4						68.3
Expected return on plan assets						(199.8)						(208.6)						(218.2)						(81.6)						(90.6)						(104.6)
Amortization of prior service credit						(2.5)						(2.5)						(2.5)						(2.8)						(2.5)						(2.5)
Recognized net actuarial loss						135.6						135.5						116.6						48.3						43.2						34.2
Curtailment gain						—						—						—						—						—						(0.1)
Settlement loss						288.1						142.1						—						211.3						—						1.2
Net periodic pension cost (income)						$	339.0					$	229.0					$	93.4					$	214.9					$	6.3					$	(0.7)

(i) Service cost is reported in cost of revenue and selling, general and administrative expenses. All other components of net periodic pension cost are reported in other (expense), net in the consolidated statements of income (loss).

Schedule of Investment Policy Targets and Ranges for Each Asset Category

The company’s investment policy targets and ranges for each asset category are as follows:

						U.S.												International
Asset Category						Target						Range						Target						Range
Equity securities						52		%				47-57%						18		%				15-20%
Debt securities						34		%				29-39%						62		%				57-66%
Cash						0		%				0-5%						0		%				0-5%
Other						14		%				9-19%						20		%				17-24%

Schedule of Expected Future Benefit Payments

As of December 31, 2021, the following benefit payments are expected to be paid from the defined benefit pension plans:

Year						U.S.						International
2022						$	308.6					$	87.9
2023						302.4						90.9
2024						295.5						94.4
2025						287.6						96.1
2026						279.1						99.6
2027 - 2030						1,240.5						538.2

Other Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Weighted-Average Assumptions

Weighted-average assumptions used to determine net periodic postretirement benefit cost were as follows:

Year ended December 31,						2021						2020						2019
Discount rate						2.21		%				5.13		%				5.67		%
Expected return on plan assets						5.50		%				5.50		%				5.50		%

Weighted-average assumptions used to determine benefit obligation at December 31 were as follows:

Year ended December 31,						2021						2020						2019
Discount rate						2.70		%				2.21		%				5.13		%

Schedule of Funded Status of Plan and Amounts Recognized in Consolidated Balance Sheet

A reconciliation of the benefit obligation, fair value of the plan assets and the funded status of the postretirement benefit plans follows:

As of December 31,						2021						2020
Change in accumulated benefit obligation
Benefit obligation at beginning of year						$	80.2					$	95.7
Service cost						0.4						0.5
Interest cost						1.8						4.4
Plan participants’ contributions						1.7						2.3
Amendments						1.2						—
Actuarial loss (gain)						1.8						(13.8)
Benefits paid						(5.9)						(8.8)
Foreign currency translation and other adjustments						(0.1)						(0.1)
Benefit obligation at end of year						$	81.1					$	80.2
Change in plan assets
Fair value of plan assets at beginning of year						$	6.0					$	6.9
Actual return on plan assets						(0.2)						(0.4)
Employer contributions						4.0						6.0
Plan participants’ contributions						1.7						2.3
Benefits paid						(5.9)						(8.8)
Fair value of plan assets at end of year						$	5.6					$	6.0
Funded status at end of year						$	(75.5)					$	(74.2)
Amounts recognized in the consolidated balance sheets consist of:
Other accrued liabilities						$	(6.1)					$	(5.4)
Long-term postretirement liabilities						(69.4)						(68.8)
Total funded status						$	(75.5)					$	(74.2)
Accumulated other comprehensive loss, net of tax
Net loss (income)						$	1.4					$	(3.0)
Prior service credit						(2.1)						(4.9)

Schedule of Components of Net Periodic Cost (Income)

Net periodic postretirement benefit cost follows:

Year ended December 31,						2021						2020						2019
Service cost(i)						$	0.4					$	0.5					$	0.5
Interest cost						1.8						4.4						4.8
Expected return on assets						(0.3)						(0.4)						(0.4)
Amortization of prior service cost						(1.7)						(1.6)						(1.7)
Recognized net actuarial (gain) loss						(2.1)						1.0						0.7
Net periodic benefit cost						$	(1.9)					$	3.9					$	3.9

(i) Service cost is reported in selling, general and administrative expenses. All other components of net periodic benefit cost are reported in other (expense), net in the consolidated statements of income (loss).

Schedule of Expected Future Benefit Payments

As of December 31, 2021, the following benefits are expected to be paid from the company’s postretirement plans:

Year						Expected Payments
2022						$	7.1
2023						6.7
2024						6.2
2025						5.7
2026						5.3
2027 – 2031						21.1

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