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Pension Plans (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Reconciliations of Plan Benefit Obligation, Fair Value of Plan Assets and Funded Status of Pension Plans

The following tables present reconciliations of pension benefit obligations, fair value of plan assets and the funded status of pension plans as of and for the years ended December 31, 2023 and 2022:

						2023						2023						2023						2022						2022						2022
			In millions			U.K.						U.S. / other						Total						U.K.						U.S. / other						Total
			Change in benefit obligations
			Benefit obligation at January 1			$	225.6					$	32.6					$	258.2					$	362.9					$	48.7					$	411.6
			Interest cost			11.0						0.2						11.2						6.2						1.3						7.5
			Settlement gain			—						(29.3)						(29.3)						—						(5.9)						(5.9)
			Actuarial gains			(2.9)						(2.5)						(5.4)						(93.7)						(9.0)						(102.7)
			Exchange difference			12.8						—						12.8						(37.0)						—						(37.0)
			Benefits paid			(12.6)						(0.9)						(13.5)						(12.8)						(2.5)						(15.3)
			Benefit obligation at December 31			$	233.9					$	0.1					$	234.0					$	225.6					$	32.6					$	258.2
			Change in plan assets
			Fair value of plan assets at January 1			$	252.6					$	28.1					$	280.7					$	376.6					$	46.8					$	423.4
			Actual return on assets			19.4						—						19.4						(71.2)						(10.4)						(81.6)
			Exchange difference			14.6						—						14.6						(40.4)						—						(40.4)
			Contributions from employer			0.2						2.1						2.3						0.4						—						0.4
			Benefits paid			(12.6)						(0.9)						(13.5)						(12.8)						(2.4)						(15.2)
			Settlement loss			—						(29.3)						(29.3)						—						(5.9)						(5.9)
			Fair value of plan assets at December 31			$	274.2					$	—					$	274.2					$	252.6					$	28.1					$	280.7
			Funded status
			Net benefit surplus / (obligation)			$	40.3					$	(0.1)					$	40.2					$	27.0					$	(4.5)					$	22.5

Schedule of Net Benefit Costs

The amounts recognized in the Consolidated Statements of Income in respect of the pension plans were as follows:

						2023						2023						2023						2022						2022						2022						2021						2021						2021
			In millions			U.K.						U.S. / other						Total						U.K.						U.S. / other						Total						U.K.						U.S. / other						Total
			In respect of defined benefit plans:
			Interest cost			11.0						0.2						11.2						6.2						1.3						7.5						5.6						1.1						6.7
			Expected return on assets			(13.8)						0.2						(13.6)						(10.4)						(0.7)						(11.1)						(10.2)						(1.8)						(12.0)
			Settlement loss			—						8.9						8.9						—						2.0						2.0						—						—						—
			Amortization of net actuarial loss			1.7						0.1						1.8						1.8						0.3						2.1						3.4						0.4						3.8
			Amortization of prior service credit			(0.4)						—						(0.4)						(0.4)						—						(0.4)						(0.4)						—						(0.4)
			Total (credit) / expense for defined benefit plans			$	(1.5)					$	9.4					$	7.9					$	(2.8)					$	2.9					$	0.1					$	(1.6)					$	(0.3)					$	(1.9)
			In respect of defined contribution plans:
			Total charge for defined contribution plans			$	2.1					$	1.6					$	3.7					$	2.0					$	1.7					$	3.7					$	2.1					$	1.5					$	3.6
			Total charge / (credit) for benefit plans			$	0.6					$	11.0					$	11.6					$	(0.8)					$	4.6					$	3.8					$	0.5					$	1.2					$	1.7

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income

The following table shows other changes in plan assets and benefit obligations recognized in other comprehensive income during the years ended December 31:

			In millions			2023						2022						2021
			Net actuarial gain			$	11.4					$	8.2					$	38.8
			Amortization of actuarial loss			1.8						2.1						3.8
			Actuarial loss recognized due to settlement event			8.9						2.0						—
			Amortization of prior service credit			(0.4)						(0.4)						(0.4)
			Total recognized in other comprehensive income			21.7						11.9						42.2
			Total recognized in net periodic benefit cost and other comprehensive income			$	13.8					$	11.8					$	44.1

The following table shows the amounts included in AOCI that have not yet been recognized as components of net periodic benefit cost for the years ended December 31:

			In millions			2023						2022
			Gross actuarial loss			$	(88.1)					$	(110.2)
			Gross prior service credit			10.6						11.0
			Total included in AOCI not yet recognized in the statement of income			$	(77.5)					$	(99.2)

Schedule of Assumptions Used

The financial assumptions used in the calculations were:

						Projected Unit Credit Valuation
						U.K.																		U.S.
						2023						2022						2021						2023						2022						2021
						%						%						%						%						%						%
			Discount rate			4.50						4.80						1.90						n/a						5.10						2.70
			Expected return on assets			4.80						5.60						3.30						n/a						4.70						2.50
			Pre-2030
			Retail Price Inflation			3.10						3.20						3.30						n/a						n/a						n/a
			Consumer Price Inflation			2.00						2.10						2.20						n/a						n/a						n/a
			Pension increases
			Pre 6 April 1997			1.80						1.90						2.00						n/a						n/a						n/a
			1997 - 2005			2.10						2.10						2.20						n/a						n/a						n/a
			Post 5 April 2005			1.60						1.70						1.80						n/a						n/a						n/a
			Post-2030
			Retail Price Inflation			3.10						3.20						3.30						n/a						n/a						n/a
			Consumer Price Inflation			3.00						3.10						3.20						n/a						n/a						n/a
			Pension increases
			Pre 6 April 1997			2.30						2.40						2.50						n/a						n/a						n/a
			1997 - 2005			2.90						3.00						3.10						n/a						n/a						n/a
			Post 5 April 2005			2.00						2.20						2.20						n/a						n/a						n/a

2023

2022

Other principal actuarial assumptions:

Years

Years

Life expectancy of male / female in the U.K. aged 65 at accounting date

21.2 / 23.1

21.2 / 23.0

Life expectancy of male / female in the U.K. aged 65 at 20 years after accounting date

22.5 / 24.6

22.5 / 24.5

Schedule of Allocation of Plan Assets

The fair value of plan assets were:

						2023						2023						2023						2022						2022						2022
			In millions			U.K.						U.S. / other						Total						U.K.						U.S. / other						Total
			Assets in active markets:
			Equities and growth funds			$	65.7					$	—					$	65.7					$	78.3					$	—					$	78.3
			Government bonds			69.6						—						69.6						65.7						—						65.7
			Corporate bonds			135.5						—						135.5						106.1						27.5						133.6
			Cash			3.4						—						3.4						2.5						0.6						3.1
			Total fair value of plan assets			$	274.2					$	—					$	274.2					$	252.6					$	28.1					$	280.7

Schedule of Expected Benefit Payments

The following benefit payments are expected to be paid by the plans for the years ended December 31 as follows:

			In millions			U.K. pension plans
			2024			$	13.6
			2025			14.4
			2026			14.6
			2027			14.5
			2028			14.6
			Thereafter			76.4

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