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FAIR VALUE MEASUREMENTS - NARRATIVE (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Adjustment to embedded derivative $ 10.2        
Asset impairments 6.0 $ 14.0 $ 41.8 $ 45.1  
Long-term obligations 24,782.3   24,782.3   $ 24,055.4
Estimate of Fair Value Measurement          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-term debt, fair value 26,600.0   26,600.0   25,000.0
Estimate of Fair Value Measurement | Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-term debt, fair value 21,900.0   21,900.0   17,500.0
Estimate of Fair Value Measurement | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-term debt, fair value $ 4,700.0   $ 4,700.0   $ 7,500.0