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Note 15 - Long-Term Incentive Compensation (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

​		Year ended December 31,
​		2024				2023				2022
DIP		$	66.4			$	70.6			$	84.0
Other			4.4				4.3				6.3
Stock-based payments expense		$	70.8			$	74.9			$	90.3
DIP funds — liability settled			84.7				81.5				84.7
Social Security costs			10.2				9.5				10.5
Profits interests and other, net			0.9				1.5				(4.8	)
Total long-term incentive compensation expense		$	166.6			$	167.4			$	180.7

Employee Service Share Based Compensation Cost Not yet Recognized [Table Text Block]

​		Unrecognized				Weighted-average
​		compensation				years
DIP		$	50.8				1.8
Other			2.4				1.2
Stock-based payments expense			53.2				1.8
DIP funds — liability settled			41.4				1.8
Social Security costs			16.2				0.7
Total unrecognized long-term incentive compensation expense		$	110.8				1.6

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

​		Year ended December 31,
​		2024				2023				2022
Fair value of options granted		£	7.2			£	6.2			£	9.3
Assumptions:
Dividend yield			4.82	%			5.89	%			4.27	%
Expected volatility			33.95	%			45.33	%			41.82	%
Risk-free interest rate			4.06	%			3.47	%			1.43	%
Expected life (years)			3.2				3.2				3.2

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

​		2024								2023								2022
​		​				Weighted-average				​				Weighted-average				​				Weighted-average
​		Shares				price				Shares				price				Shares				price
Outstanding at January 1			284,954			$	22.82				386,584			$	19.18				492,889			$	20.83
Granted			100,151			$	25.29				137,019			$	21.67				127,903			$	24.83
Exercised			(66,592	)		$	22.30				(201,795	)		$	14.95				(193,821	)		$	24.34
Forfeited			(25,118	)		$	23.21				(36,854	)		$	23.37				(40,387	)		$	22.78
Outstanding at December 31			293,395			$	23.75				284,954			$	22.82				386,584			$	19.18
Exercisable(1)			4,823			$	23.56				5,954			$	8.23				32,710			$	10.46
Vested or expected to vest			293,395			$	23.75				284,954			$	22.82				386,584			$	19.18

Schedule of Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block]

​		Year ended December 31,
​		2024				2023				2022
Exercised		$	0.9			$	2.4			$	1.3
Outstanding		$	5.8			$	2.3			$	2.4
Exercisable		$	0.1			$	0.1			$	0.5

 ​

Schedule of Nonvested Share Activity [Table Text Block]

​		2024								2023								2022
​		​				Weighted-average				​				Weighted-average				​				Weighted-average
​		Shares				price				Shares				price				Shares				price
Unvested at January 1			4,884,487			$	29.86				5,641,839			$	29.99				4,949,927			$	26.42
Granted			1,996,676			$	32.48				2,141,254			$	27.08				3,581,420			$	32.44
Vested			(2,647,424	)		$	30.25				(2,669,197	)		$	27.93				(2,733,825	)		$	26.29
Forfeited			(136,067	)		$	30.96				(229,409	)		$	29.70				(155,683	)		$	31.48
Unvested at December 31			4,097,672			$	30.85				4,884,487			$	29.86				5,641,839			$	29.99

​		2024								2023								2022
​		​				Weighted-average				​				Weighted-average				​				Weighted-average
​		Shares				price				Shares				price				Shares				price
Unvested at January 1			276,537			$	27.44				50,900			$	29.38				258,024			$	24.31
Granted			247,624			$	32.12				333,389			$	27.44				-			$	-
Adjustment to shares granted due to performance measures			-			$	-				-			$	-				39,837			$	24.55
Vested			-			$	-				(50,900	)		$	29.38				(246,961	)		$	22.28
Forfeited			(8,441	)		$	31.10				(56,852	)		$	27.44				-			$	-
Unvested at December 31			515,720			$	29.63				276,537			$	27.44				50,900			$	29.38

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