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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Assets:    
Gross derivative assets $ 694.8 $ 261.1
Liabilities:    
Gross derivative liabilities 639.1 266.6
Fair value measured on recurring basis    
Assets:    
Total assets at fair value 704.0 270.4
Liabilities:    
Total liabilities at fair value 639.1 266.6
Fair value measured on recurring basis | Level 1 Inputs    
Assets:    
Total assets at fair value 417.8 148.3
Liabilities:    
Total liabilities at fair value 437.7 177.6
Fair value measured on recurring basis | Level 2 Inputs    
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt 1,100.0 628.8
Notes receivable 23.4 21.0
Assets:    
Total assets at fair value 271.3 111.4
Liabilities:    
Total liabilities at fair value 197.6 80.9
Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Total assets at fair value 14.8 10.7
Liabilities:    
Total liabilities at fair value 3.8 8.1
Commodity contracts | Fair value measured on recurring basis    
Assets:    
Gross derivative assets 692.4 259.0
Liabilities:    
Gross derivative liabilities 623.2 255.0
Commodity contracts | Fair value measured on recurring basis | Level 1 Inputs    
Assets:    
Gross derivative assets 417.8 148.3
Liabilities:    
Gross derivative liabilities 437.7 177.6
Commodity contracts | Fair value measured on recurring basis | Level 2 Inputs    
Assets:    
Gross derivative assets 259.7 100.0
Liabilities:    
Gross derivative liabilities 181.7 69.3
Commodity contracts | Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Gross derivative assets 14.8 10.7
Liabilities:    
Gross derivative liabilities 3.8 8.1
Foreign currency contracts | Fair value measured on recurring basis    
Assets:    
Gross derivative assets 2.4 2.0
Liabilities:    
Gross derivative liabilities 10.9 11.6
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 2.4 2.0
Liabilities:    
Gross derivative liabilities 10.9 11.6
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 0.0  
Liabilities:    
Gross derivative liabilities 4.9  
Interest rate contracts | Fair value measured on recurring basis | Level 1 Inputs    
Assets:    
Gross derivative assets 0.0  
Liabilities:    
Gross derivative liabilities 0.0  
Interest rate contracts | Fair value measured on recurring basis | Level 2 Inputs    
Assets:    
Gross derivative assets 0.0  
Liabilities:    
Gross derivative liabilities 4.9  
Interest rate contracts | Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Gross derivative assets 0.0  
Liabilities:    
Gross derivative liabilities 0.0  
Cash surrender value of life insurance | Fair value measured on recurring basis    
Assets:    
Cash surrender value of life insurance 9.2 9.4
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 9.2 9.4
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