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Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

​		Year ended December 31,
​		2024				2023				2022
Current income taxes:		​				​				​
UK		$	14.3			$	15.2			$	10.5
U.S., including state and local			143.2				88.1				95.9
International			6.4				3.0				8.8
Total current income taxes			163.9				106.3				115.2
Deferred income taxes:		​				​				​
UK			2.2				(4.0	)			(10.3	)
U.S., including state and local			1.0				(2.0	)			10.0
International			(0.8	)			—				(14.0	)
Total deferred income benefits			2.4				(6.0	)			(14.3	)
Total income tax expense		$	166.3			$	100.3			$	100.9

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

​		Year ended December 31,
​		2024				2023				2022
UK		$	57.4			$	86.4			$	(44.1	)
U.S.			595.6				423.4				428.7
International			(41.1	)			17.2				(9.2	)
Total income before taxes		$	611.9			$	527.0			$	375.4

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

​		Year ended December 31,
​		2024				2023				2022
UK statutory corporation tax rate			25.0	%			23.5	%			19.0	%
Effect of foreign tax rates			(1.7	)			0.1				6.3
Equity-based compensation			0.4				0.3				0.7
Tax adjustments			0.9				0.5				2.0
Impact of changes in statutory tax rates on deferred taxes			—				(1.9	)			(1.3	)
Foreign currency translation reserves reclassification			5.6				1.6				(0.3	)
Taxes applicable to prior years			(1.2	)			(1.9	)			(4.5	)
Other, net			(1.7	)			(3.4	)			0.3
Effective income tax rate, controlling interest			27.3	%			18.8	%			22.2	%
Net loss (income) attributable to noncontrolling interests			(0.1	)			0.2				4.7
Total effective income tax rate			27.2	%			19.0	%			26.9	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

​		December 31,
​		2024				2023
Deferred tax assets:		​				​
Compensation and staff benefits		$	64.5			$	59.8
Loss carryforwards(1)			127.6				88.4
Accrued liabilities			8.0				7.0
Lease liabilities			18.7				16.8
Other			(2.1	)			5.3
Gross deferred tax assets			216.7				177.3
Valuation allowance			(119.4	)			(76.8	)
Deferred tax assets, net of valuation allowance		$	97.3			$	100.5
Deferred tax liabilities:		​				​
Retirement benefits		$	(17.4	)		$	(21.4	)
Goodwill and acquired intangible assets			(628.9	)			(628.6	)
Lease ROU assets			(18.0	)			(16.2	)
Other			(1.3	)			(3.5	)
Gross deferred tax liabilities			(665.6	)			(669.7	)
Total deferred tax liabilities(2)		$	(568.3	)		$	(569.2	)

​		December 31,
​		2024				2023
Deferred tax assets, net (included in other non-current assets)		$	1.0			$	1.6
Deferred tax liabilities, net			(569.3	)			(570.8	)
Total deferred tax liabilities		$	(568.3	)		$	(569.2	)

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

​		Year ended December 31,
​		2024				2023				2022
Beginning balance		$	28.4			$	26.7			$	19.2
Additions for tax positions of current year			5.7				6.9				9.7
Reduction due to settlement with taxing authorities			(0.8	)			(0.3	)			(1.4	)
Reduction due to statute expirations			(4.3	)			(4.6	)			(0.5	)
Total change due to true up			—				(0.1	)			—
Total removed due to audit payment			—				(0.4	)			—
Foreign currency translation			(0.1	)			0.2				(0.3	)
Ending balance		$	28.9			$	28.4			$	26.7

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