Long-Term Debt - Other (Details) £ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) facility	Sep. 30, 2022 GBP (£)	Sep. 30, 2022 AUD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Outstanding debt	$ 1,637,900,000			$ 1,474,000,000
U.S. credit agreement — revolving credit line
Debt Instrument [Line Items]
Maximum credit available	800,000,000
Maximum amount available for letters of credit	50,000,000
Future borrowings available for foreign acquisitions	150,000,000
Outstanding debt	0			0
U.K. credit agreement — revolving credit line
Debt Instrument [Line Items]
Maximum credit available | £		£ 150.0
Additional facility capacity under accordion feature | £		100.0
Outstanding debt	0			0
U.K. credit agreement — overdraft line of credit
Debt Instrument [Line Items]
Maximum credit available | £		52.0
Amount of demand overdraft lines of credit available during specified time periods each year | £		£ 40.0
Outstanding debt	$ 0			0
Senior Subordinated Notes
Debt Instrument [Line Items]
Domestic Subsidiaries ownership guaranteeing obligations (as a percent)	100.00%	100.00%	100.00%
Change of control, redemption price as a percentage of principal	101.00%
Sale of assets, redemption price as percentage of principal	100.00%
3.50% senior subordinated notes due 2025
Debt Instrument [Line Items]
Outstanding debt	$ 545,800,000			544,700,000
Interest rate (as a percent)	3.50%	3.50%	3.50%
3.75% senior subordinated notes due 2029
Debt Instrument [Line Items]
Outstanding debt	$ 494,900,000			494,300,000
Interest rate (as a percent)	3.75%	3.75%	3.75%
Australia capital loan agreement
Debt Instrument [Line Items]
Maximum credit available			$ 35.4
Outstanding debt	$ 20,800,000		32.5	26,600,000
Number of facilities | facility	2
Debt instrument, term	3 years
Call period	90 days
Maximum amount of debt guaranteed by the Company's U.S. parent company			50.0
Australia working capital loan agreement
Debt Instrument [Line Items]
Maximum credit available			50.0
Outstanding debt	$ 5,800,000		9.0	0
Debt instrument, term	1 year
Call period	90 days
Maximum amount of debt guaranteed by the Company's U.S. parent company			$ 50.0
Revolving Mortgage Facility
Debt Instrument [Line Items]
Maximum credit available	$ 225,000,000
Outstanding debt	138,400,000
Current borrowing capacity	205,200,000
Mortgage facilities
Debt Instrument [Line Items]
Outstanding debt	$ 530,100,000			$ 353,800,000
LIBOR | U.S. credit agreement — revolving credit line
Debt Instrument [Line Items]
Line of credit basis spread on variable rate (as a percent)	1.50%
LIBOR | Revolving Mortgage Facility
Debt Instrument [Line Items]
Line of credit basis spread on variable rate (as a percent)	1.50%
Australian BBSW 30-Day Bill Rate | Australia capital loan agreement
Debt Instrument [Line Items]
Line of credit basis spread on variable rate (as a percent)	3.00%
Base rate of interest on loans	30-day Bill Rate
Australian BBSW 30-Day Bill Rate | Australia working capital loan agreement
Debt Instrument [Line Items]
Line of credit basis spread on variable rate (as a percent)	3.00%
Base rate of interest on loans	30-day Bill Rate
Debt Redemption, Prior To June 12, 2024 | 3.75% senior subordinated notes due 2029
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	100.00%
Debt Instrument Redemption Period Prior To May2021 | 3.75% senior subordinated notes due 2029
Debt Instrument [Line Items]
Specified equity offerings, percentage of debt which may be redeemed	103.75%
Minimum | Sterling Overnight Index Average (SONIA) | U.K. credit agreement — revolving credit line
Debt Instrument [Line Items]
Line of credit basis spread on variable rate (as a percent)	1.10%
Minimum | Debt Instrument Redemption Period Prior To September 2022 | 3.75% senior subordinated notes due 2029
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	40.00%
Maximum | Sterling Overnight Index Average (SONIA) | U.K. credit agreement — revolving credit line
Debt Instrument [Line Items]
Line of credit basis spread on variable rate (as a percent)	2.10%