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Long-Term Debt (Details)
£ in Millions, $ in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 01, 2020
USD ($)
Dec. 31, 2020
AUD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
AUD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Oct. 01, 2020
USD ($)
Aug. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Long Term Debt                  
Total long-term debt         $ 1,689.6       $ 2,360.3
Less: current portion         (87.5)       (103.3)
Net long-term debt         1,602.1       2,257.0
Scheduled maturities of long-term debt for each of the next five years and thereafter                  
2020         87.5        
2021         24.2        
2022         128.4        
2023         23.6        
2024         689.6        
2024 and thereafter         736.3        
US Credit Agreement Revolving Credit Line                  
Long Term Debt                  
Total long-term debt         108.0       45.0
Increase in borrowing capacity $ 100.0                
Maximum credit available 800.0                
Revolving loans solely for future U.S. acquisitions 250.0                
Future borrowings available for foreign acquisitions 150.0                
Maximum amount available for letters of credit $ 50.0                
Incremental interest rate for uncollateralized borrowings in excess of borrowing base (as a percent) 1.25%                
Balance outstanding under credit agreement         108.0        
US Credit Agreement Revolving Credit Line | LIBOR                  
Long Term Debt                  
Base rate of interest on loans 1.75%                
UK Credit Agreement Revolving Credit Line                  
Long Term Debt                  
Total long-term debt                 165.8
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                  
Long Term Debt                  
Line of credit basis spread on variable rate (as a percent)       1.10%          
UK Credit Agreement Revolving Credit Line | Maximum | LIBOR                  
Long Term Debt                  
Line of credit basis spread on variable rate (as a percent)       2.10%          
UK Credit Agreement Overdraft Line of Credit                  
Long Term Debt                  
Maximum credit available | £           52.0      
Amount of demand overdraft lines of credit available during specified time periods each year | £           £ 40.0      
Senior Subordinated Notes                  
Long Term Debt                  
Domestic Subsidiaries ownership guaranteeing obligations (as a percent)   100.00%   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%          
3.75% senior subordinated notes redeemed August 15, 2020                  
Long Term Debt                  
Total long-term debt                 $ 299.2
Interest rate (as a percent)   3.75% 3.75% 3.75% 3.75% 3.75%     3.75%
Repayment of debt at maturity     $ 300.0            
5.75% senior subordinated notes due 2022                  
Long Term Debt                  
Total long-term debt                 $ 547.6
Interest rate (as a percent)   5.75%   5.75% 5.75% 5.75% 5.75%   5.75%
Repayment of debt             $ 550.0    
5.375% senior subordinated notes due 2024                  
Long Term Debt                  
Total long-term debt                 $ 298.0
Interest rate (as a percent)   5.375%   5.375% 5.375% 5.375%     5.375%
Repayment of debt         $ 300.0        
Percentage of principal amount at which the entity may redeem the notes   101.792%              
3.50% senior subordinated notes due 2025                  
Long Term Debt                  
Total long-term debt         $ 543.2        
Interest rate (as a percent)   3.50%   3.50% 3.50% 3.50%   3.50%  
Principal amount         $ 550.0     $ 550.0  
3.50% senior subordinated notes due 2025 | Debt Instrument Redemption Period Prior To September 2022                  
Long Term Debt                  
Interest rate (as a percent)   3.50%   3.50% 3.50% 3.50%      
Percentage of principal amount at which the entity may redeem the notes       100.00%          
Specified equity offerings, percentage of debt which may be redeemed       103.50%          
3.50% senior subordinated notes due 2025 | Minimum | Debt Instrument Redemption Period Prior To September 2022                  
Long Term Debt                  
Percentage of principal amount at which the entity may redeem the notes       40.00%          
5.50% senior subordinated notes due 2026                  
Long Term Debt                  
Total long-term debt         $ 496.4       $ 495.7
Interest rate (as a percent)   5.50%   5.50% 5.50% 5.50%     5.50%
Principal amount         $ 500.0        
5.50% senior subordinated notes due 2026 | Debt Redemption Prior to May 15, 2021                  
Long Term Debt                  
Interest rate (as a percent)   5.50%   5.50% 5.50% 5.50%      
Percentage of principal amount at which the entity may redeem the notes       100.00%          
5.50% senior subordinated notes due 2026 | Debt Instrument Redemption Period On or After May 15, 2021                  
Long Term Debt                  
Interest rate (as a percent)   5.50%   5.50% 5.50% 5.50%      
Australia capital loan agreement                  
Long Term Debt                  
Total long-term debt         $ 32.1       $ 31.7
Maximum credit available   $ 50.0   $ 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   $ 50.0          
Balance outstanding under credit agreement   41.7   $ 41.7 32.1        
Number of facilities | item       2          
Australia capital loan agreement | Australian BBSW 30-Day Bill Rate                  
Long Term Debt                  
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                  
Long Term Debt                  
Maximum credit available   50.0   $ 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   $ 50.0          
Balance outstanding under credit agreement         0.0        
Australia working capital loan agreement | Australian BBSW 30-Day Bill Rate                  
Long Term Debt                  
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                  
Long Term Debt                  
Total long-term debt         458.1       423.2
Balance outstanding under credit agreement         458.1        
Other debt                  
Long Term Debt                  
Total long-term debt         $ 51.8       $ 54.1