Long-Term Debt - Schedule of Long-Term Debt Instruments (Details) $ in Millions, $ in Millions, $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2023 CAD ($)	Dec. 31, 2023 AUD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021
Debt Instrument
Total long-term debt	$ 1,629.2				$ 1,622.1
Less: current portion	(209.7)				(75.2)
Net long-term debt	1,419.5				1,546.9
U.S. credit agreement — revolving credit line
Debt Instrument
Total long-term debt	0.0				0.0
U.K. credit agreement — revolving credit line
Debt Instrument
Total long-term debt	$ 0.0	£ 0			24.2
3.50% senior subordinated notes due 2025
Debt Instrument
Interest rate	3.50%	3.50%	3.50%	3.50%
Total long-term debt	$ 547.7				$ 546.2
3.75% senior subordinated notes due 2029
Debt Instrument
Interest rate	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%
Total long-term debt	$ 495.8				$ 495.1
Canada credit agreement
Debt Instrument
Total long-term debt	81.5		$ 108.0		0.0
Australia credit agreement
Debt Instrument
Total long-term debt	62.7			$ 92.0	21.6
Mortgage facilities
Debt Instrument
Total long-term debt	402.1				494.3
Other
Debt Instrument
Total long-term debt	$ 39.4				$ 40.7