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LEASES: (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases    
Lessee, operating lease, option to extend false  
Lessee, operating lease, option to terminate false  
The weighted average remaining lease term 9 years  
The weighted average discount rate 3.64%  
Total lease expense $ 28.6 $ 29.0
Maturities of lease liabilities    
2021 85.9  
2022 113.7  
2023 112.2  
2024 104.8  
2025 103.7  
After 2025 723.0  
Total lease payments 1,243.3  
Less: interest on lease liabilities (281.5)  
Lease liabilities 961.8  
Cost of sales (exclusive of depreciation, amortization and depletion)    
Leases    
Total lease expense $ 28.6 28.9
Selling, general and administrative    
Leases    
Total lease expense   $ 0.1
Minimum    
Leases    
Remaining lease terms 2 years  
Maximum    
Leases    
Remaining lease terms 12 years  
Short term lease costs $ 0.1