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Long-Term Debt - Summary (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Long Term Debt        
Total long-term debt $ 1,424.6   $ 1,689.6  
Less: current portion (67.9)   (87.5)  
Net long-term debt 1,356.7   1,602.1  
US Credit Agreement Revolving Credit Line        
Long Term Debt        
Total long-term debt     108.0  
3.50% senior subordinated notes due 2025        
Long Term Debt        
Total long-term debt $ 544.3   $ 543.2  
Interest rate (as a percent) 3.50%   3.50% 3.50%
5.50% senior subordinated notes due 2026        
Long Term Debt        
Total long-term debt     $ 496.4  
Interest rate (as a percent) 5.50% 5.50% 5.50%  
3.75% senior subordinated notes due 2029        
Long Term Debt        
Total long-term debt $ 494.1      
Interest rate (as a percent) 3.75% 3.75% 3.75%  
Australia capital loan agreement        
Long Term Debt        
Total long-term debt $ 27.4   $ 32.1  
Mortgage facilities        
Long Term Debt        
Total long-term debt 319.8   458.1  
Other debt        
Long Term Debt        
Total long-term debt $ 39.0   $ 51.8