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SUPPLEMENTAL CASH FLOW INFORMATION - SUPPLEMENTAL INFORMATION (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Supplemental cash flow information    
Cash paid for interest, net of amount capitalized $ 76.8 $ 85.8
Cash received for income taxes, net (2.5) (11.2)
Significant non-cash investing and financing transactions:    
Accounts payable related to construction costs 97.8 102.5
Receivable related to insurance proceeds for property damage (1) $ 2.7 $ 0.0