Long-Term Debt - Summary (Details) £ in Millions, $ in Millions, $ in Millions, $ in Millions	Sep. 30, 2023 USD ($)	Sep. 30, 2023 GBP (£)	Sep. 30, 2023 CAD ($)	Sep. 30, 2023 AUD ($)	Dec. 31, 2022 USD ($)
Long Term Debt
Total long-term debt	$ 1,707.3				$ 1,622.1
Less: current portion	(170.0)				(75.2)
Net long-term debt	1,537.3				1,546.9
U.S. credit agreement — revolving credit line
Long Term Debt
Total long-term debt	0.0				0.0
U.K. credit agreement — revolving credit line
Long Term Debt
Total long-term debt	6.1	£ 5.0			24.2
3.50% senior subordinated notes due 2025
Long Term Debt
Total long-term debt	$ 547.3				546.2
Interest rate	3.50%	3.50%	3.50%	3.50%
3.75% senior subordinated notes due 2029
Long Term Debt
Total long-term debt	$ 495.6				495.1
Interest rate	3.75%	3.75%	3.75%	3.75%
Canada credit agreement
Long Term Debt
Total long-term debt	$ 81.7		$ 111.0		0.0
Australia credit agreement
Long Term Debt
Total long-term debt	33.2			$ 75.0	21.6
Mortgage facilities
Long Term Debt
Total long-term debt	504.5				494.3
Other
Long Term Debt
Total long-term debt	$ 38.9				$ 40.7