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Long-Term Debt - Other (Details)
£ in Millions, $ in Millions, $ in Millions
6 Months Ended
Jun. 30, 2021
AUD ($)
item
Jun. 30, 2021
USD ($)
Jun. 30, 2021
GBP (£)
Apr. 28, 2021
USD ($)
Dec. 31, 2020
US Credit Agreement Revolving Credit Line          
Debt Instrument          
Maximum credit available   $ 800.0   $ 800.0  
Revolving loans solely for future U.S. acquisitions   250.0      
Future borrowings available for foreign acquisitions   150.0      
Amount of the acquisition line consolidated into general revolving line per the amended debt agreement       $ 250.0  
Maximum amount available for letters of credit   50.0      
Incremental interest rate for uncollateralized borrowings in excess of maximum limit (as a percent) 1.25%        
Balance outstanding under credit agreement   0.0      
US Credit Agreement Revolving Credit Line | LIBOR          
Debt Instrument          
Base rate of interest on loans 1.75%        
UK Credit Agreement Revolving Credit Line          
Debt Instrument          
Maximum credit available | £     £ 150.0    
Additional facility capacity under accordion feature | £     100.0    
Balance outstanding under credit agreement   $ 0.0      
UK Credit Agreement Revolving Credit Line | Minimum | LIBOR          
Debt Instrument          
Line of credit basis spread on variable rate (as a percent) 1.10%        
UK Credit Agreement Revolving Credit Line | Maximum | LIBOR          
Debt Instrument          
Line of credit basis spread on variable rate (as a percent) 2.10%        
UK Credit Agreement Overdraft Line of Credit          
Debt Instrument          
Maximum credit available | £     52.0    
Amount of demand overdraft lines of credit available during specified time periods each year | £     £ 40.0    
Senior Subordinated Notes          
Debt Instrument          
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%        
5.75% senior subordinated notes due 2022          
Debt Instrument          
Interest rate (as a percent) 5.50% 5.50% 5.50%    
Principal amount   $ 500.0      
3.50% senior subordinated notes due 2025          
Debt Instrument          
Interest rate (as a percent) 3.50% 3.50% 3.50%   3.50%
Principal amount   $ 550.0      
3.50% senior subordinated notes due 2025 | Debt Instrument Redemption Period Prior To September 2022          
Debt Instrument          
Interest rate (as a percent) 3.50% 3.50% 3.50%    
Redemption price as a percentage of principal 100.00%        
Specified equity offerings, percentage of debt which may be redeemed 103.50%        
3.50% senior subordinated notes due 2025 | Debt Instrument Redemption Period On or After September 2022          
Debt Instrument          
Interest rate (as a percent) 3.50% 3.50% 3.50%    
3.50% senior subordinated notes due 2025 | Minimum | Debt Instrument Redemption Period Prior To September 2022          
Debt Instrument          
Specified equity offerings, percentage of debt which may be redeemed 40.00%        
5.50% senior subordinated notes due 2026          
Debt Instrument          
Interest rate (as a percent)         5.50%
3.75% senior subordinated notes due 2029          
Debt Instrument          
Interest rate (as a percent) 3.75% 3.75% 3.75%   3.75%
Principal amount   $ 500.0      
3.75% senior subordinated notes due 2029 | Debt Instrument Redemption Period Prior to June 15, 2024          
Debt Instrument          
Interest rate (as a percent) 3.75% 3.75% 3.75%    
Redemption price as a percentage of principal 100.00%        
Specified equity offerings, percentage of debt which may be redeemed 40.00%        
Certain equity offerings, redemption price as a percentage of principal 103.75%        
3.75% senior subordinated notes due 2029 | Debt Instrument Redemption Period On or After June 15, 2024          
Debt Instrument          
Interest rate (as a percent) 3.75% 3.75% 3.75%    
Australia capital loan agreement          
Debt Instrument          
Maximum credit available $ 50.0        
Debt term 5 years        
Call period 90 days        
Maximum amount of debt guaranteed by the Company's U.S. parent company $ 50.0        
Balance outstanding under credit agreement $ 39.1 $ 29.3      
Number of facilities | item 2        
Australia capital loan agreement | Australian BBSW 30-Day Bill Rate          
Debt Instrument          
Base rate of interest on loans 30-day Bill Rate        
Line of credit basis spread on variable rate (as a percent) 3.00%        
Australia working capital loan agreement          
Debt Instrument          
Maximum credit available $ 50.0        
Debt term 1 year        
Call period 90 days        
Maximum amount of debt guaranteed by the Company's U.S. parent company $ 50.0        
Balance outstanding under credit agreement $ 10.0 7.5      
Australia working capital loan agreement | Australian BBSW 30-Day Bill Rate          
Debt Instrument          
Base rate of interest on loans 30-day Bill Rate        
Line of credit basis spread on variable rate (as a percent) 3.00%        
Mortgage facilities          
Debt Instrument          
Balance outstanding under credit agreement   $ 398.9