Long-Term Debt - Schedule of Long-Term Debt Instruments (Details) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2025 GBP (£)
Debt Instrument
Total long-term debt	$ 2,165.5	$ 1,852.0
Less: current portion	(355.0)	(721.2)
Net long-term debt	1,810.5	1,130.8
Repayment of debt	550.0
U.S. credit agreement — revolving credit line
Debt Instrument
Total long-term debt	333.0	0.0
U.K. credit agreement — revolving credit line
Debt Instrument
Total long-term debt	$ 87.6	$ 171.4		£ 65.0
3.50% senior subordinated notes due 2025
Debt Instrument
Interest rate	3.50%	3.50%	3.50%	3.50%
Total long-term debt	$ 0.0	$ 549.1
Repayment of debt	$ 550.0	$ 0.0	$ 0.0
3.75% senior subordinated notes due 2029
Debt Instrument
Interest rate	3.75%	3.75%		3.75%
Total long-term debt	$ 497.3	$ 496.6
Mortgage facilities
Debt Instrument
Total long-term debt	792.5	474.8
Other debt
Debt Instrument
Total long-term debt	$ 455.1	$ 160.1