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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt $ 524.7  
Assets:    
Gross Derivative Assets 378.5 $ 261.1
Liabilities:    
Gross Derivative Liabilities 349.5 266.6
Fair value measured on recurring basis    
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt 524.7  
Assets:    
Total assets 389.9 270.4
Liabilities:    
Total liabilities at fair value 349.5 266.6
Fair value measured on recurring basis | Level 1    
Assets:    
Total assets 233.5 148.3
Liabilities:    
Total liabilities at fair value 223.0 177.6
Fair value measured on recurring basis | Level 2    
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt   628.8
Notes receivable 45.7 21.0
Assets:    
Total assets 146.8 111.4
Liabilities:    
Total liabilities at fair value 120.2 80.9
Fair value measured on recurring basis | Level 3    
Assets:    
Total assets 9.5 10.7
Liabilities:    
Total liabilities at fair value 6.3 8.1
Commodity contracts | Fair value measured on recurring basis    
Assets:    
Gross Derivative Assets 371.0 259.0
Liabilities:    
Gross Derivative Liabilities 326.0 255.0
Commodity contracts | Fair value measured on recurring basis | Level 1    
Assets:    
Gross Derivative Assets 233.5 148.3
Liabilities:    
Gross Derivative Liabilities 223.0 177.6
Commodity contracts | Fair value measured on recurring basis | Level 2    
Assets:    
Gross Derivative Assets 127.9 100.0
Liabilities:    
Gross Derivative Liabilities 96.8 69.3
Commodity contracts | Fair value measured on recurring basis | Level 3    
Assets:    
Gross Derivative Assets 9.5 10.7
Liabilities:    
Gross Derivative Liabilities 6.3 8.1
Foreign currency contracts | Fair value measured on recurring basis    
Assets:    
Gross Derivative Assets 7.5 2.0
Liabilities:    
Gross Derivative Liabilities 19.8 11.6
Foreign currency contracts | Fair value measured on recurring basis | Level 1    
Assets:    
Gross Derivative Assets 0.0 0.0
Liabilities:    
Gross Derivative Liabilities 0.0 0.0
Foreign currency contracts | Fair value measured on recurring basis | Level 2    
Assets:    
Gross Derivative Assets 7.5 2.0
Liabilities:    
Gross Derivative Liabilities 19.8 11.6
Foreign currency contracts | Fair value measured on recurring basis | Level 3    
Assets:    
Gross Derivative Assets 0.0 0.0
Liabilities:    
Gross Derivative Liabilities 0.0 0.0
Cash surrender value of life insurance | Fair value measured on recurring basis    
Assets:    
Cash surrender value of life insurance 11.4 9.4
Cash surrender value of life insurance | Fair value measured on recurring basis | Level 1    
Assets:    
Cash surrender value of life insurance 0.0 0.0
Cash surrender value of life insurance | Fair value measured on recurring basis | Level 2    
Assets:    
Cash surrender value of life insurance 11.4 9.4
Cash surrender value of life insurance | Fair value measured on recurring basis | Level 3    
Assets:    
Cash surrender value of life insurance 0.0 $ 0.0
Interest rate contract    
Liabilities:    
Gross Derivative Liabilities 3.7  
Interest rate contract | Level 1    
Liabilities:    
Gross Derivative Liabilities 0.0  
Interest rate contract | Level 2    
Liabilities:    
Gross Derivative Liabilities 3.7  
Interest rate contract | Level 3    
Liabilities:    
Gross Derivative Liabilities $ 0.0