Long-Term Debt - Summary (Details) £ in Millions, $ in Millions	Mar. 31, 2022 USD ($)	Mar. 31, 2022 GBP (£)	Mar. 31, 2022 AUD ($)	Dec. 31, 2021 USD ($)
Long Term Debt
Total long-term debt	$ 1,463,300,000			$ 1,474,000,000
Less: current portion	(79,400,000)			(82,000,000.0)
Net long-term debt	1,383,900,000			1,392,000,000
U.S. credit agreement — revolving credit line
Long Term Debt
Total long-term debt	0			0
U.K. credit agreement — revolving credit line
Long Term Debt
Total long-term debt	22,300,000	£ 17.0		0
U.K. credit agreement — overdraft line of credit
Long Term Debt
Total long-term debt	0			0
3.50% senior subordinated notes due 2025
Long Term Debt
Total long-term debt	$ 545,100,000			544,700,000
Interest rate (as a percent)	3.50%	3.50%	3.50%
3.75% senior subordinated notes due 2029
Long Term Debt
Total long-term debt	$ 494,500,000			494,300,000
Interest rate (as a percent)	3.75%	3.75%	3.75%
Australia capital loan agreement
Long Term Debt
Total long-term debt	$ 26,500,000			26,600,000
Australia working capital loan agreement
Long Term Debt
Total long-term debt	3,000,000		$ 4.0	0
Mortgage facilities
Long Term Debt
Total long-term debt	325,900,000			353,800,000
Other
Long Term Debt
Total long-term debt	$ 46,000,000.0			$ 54,600,000