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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Assets:    
Gross derivative assets $ 565.4 $ 378.5
Liabilities:    
Gross derivative liabilities 576.0 349.5
Fair value measured on recurring basis    
Assets:    
Total assets at fair value 578.5 389.9
Liabilities:    
Total liabilities at fair value 576.0 349.5
Fair value measured on recurring basis | Level 1 Inputs    
Assets:    
Total assets at fair value 378.0 233.5
Liabilities:    
Total liabilities at fair value 340.5 223.0
Fair value measured on recurring basis | Level 2 Inputs    
Assets:    
Total assets at fair value 196.2 146.8
Liabilities:    
Total liabilities at fair value 229.8 120.2
Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Total assets at fair value 4.4 9.5
Liabilities:    
Total liabilities at fair value 5.7 6.3
Commodity contracts | Fair value measured on recurring basis    
Assets:    
Gross derivative assets 559.0 371.0
Liabilities:    
Gross derivative liabilities 570.0 326.0
Commodity contracts | Fair value measured on recurring basis | Level 1 Inputs    
Assets:    
Gross derivative assets 378.0 233.5
Liabilities:    
Gross derivative liabilities 340.5 223.0
Commodity contracts | Fair value measured on recurring basis | Level 2 Inputs    
Assets:    
Gross derivative assets 176.6 127.9
Liabilities:    
Gross derivative liabilities 223.8 96.8
Commodity contracts | Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Gross derivative assets 4.4 9.5
Liabilities:    
Gross derivative liabilities 5.7 6.3
Foreign currency contracts | Fair value measured on recurring basis    
Assets:    
Gross derivative assets 4.1 7.5
Liabilities:    
Gross derivative liabilities 4.7 19.8
Foreign currency contracts | Fair value measured on recurring basis | Level 1 Inputs    
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 Inputs    
Assets:    
Gross derivative assets 4.1 7.5
Liabilities:    
Gross derivative liabilities 4.7 19.8
Foreign currency contracts | Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Gross derivative assets 0.0 0.0
Liabilities:    
Gross derivative liabilities 0.0 0.0
Interest rate contracts | Fair value measured on recurring basis    
Assets:    
Gross derivative assets 2.3  
Liabilities:    
Gross derivative liabilities 1.3 3.7
Interest rate contracts | Fair value measured on recurring basis | Level 1 Inputs    
Assets:    
Gross derivative assets 0.0  
Liabilities:    
Gross derivative liabilities 0.0 0.0
Interest rate contracts | Fair value measured on recurring basis | Level 2 Inputs    
Assets:    
Gross derivative assets 2.3  
Liabilities:    
Gross derivative liabilities 1.3 3.7
Interest rate contracts | Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Gross derivative assets 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 13.2 11.4
Cash surrender value of life insurance | Fair value measured on recurring basis | Level 1 Inputs    
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 Inputs    
Assets:    
Cash surrender value of life insurance 13.2 11.4
Cash surrender value of life insurance | Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Cash surrender value of life insurance $ 0.0 $ 0.0