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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Assets:    
Gross derivative assets $ 445.5 $ 261.1
Liabilities:    
Gross derivative liabilities 400.7 266.6
Fair value measured on recurring basis    
Assets:    
Total assets at fair value 456.3 270.4
Liabilities:    
Total liabilities at fair value 400.7 266.6
Fair value measured on recurring basis | Level 1 Inputs    
Assets:    
Total assets at fair value 270.3 148.3
Liabilities:    
Total liabilities at fair value 264.3 177.6
Fair value measured on recurring basis | Level 2 Inputs    
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt 526.6 628.8
Notes receivable 46.7 21.0
Assets:    
Total assets at fair value 171.8 111.4
Liabilities:    
Total liabilities at fair value 130.0 80.9
Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Total assets at fair value 14.2 10.7
Liabilities:    
Total liabilities at fair value 6.4 8.1
Commodity contracts | Fair value measured on recurring basis    
Assets:    
Gross derivative assets 443.8 259.0
Liabilities:    
Gross derivative liabilities 385.5 255.0
Commodity contracts | Fair value measured on recurring basis | Level 1 Inputs    
Assets:    
Gross derivative assets 270.3 148.3
Liabilities:    
Gross derivative liabilities 264.3 177.6
Commodity contracts | Fair value measured on recurring basis | Level 2 Inputs    
Assets:    
Gross derivative assets 159.3 100.0
Liabilities:    
Gross derivative liabilities 114.8 69.3
Commodity contracts | Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Gross derivative assets 14.2 10.7
Liabilities:    
Gross derivative liabilities 6.4 8.1
Foreign currency contracts | Fair value measured on recurring basis    
Assets:    
Gross derivative assets 1.6 2.0
Liabilities:    
Gross derivative liabilities 10.4 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 1.6 2.0
Liabilities:    
Gross derivative liabilities 10.4 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    
Liabilities:    
Gross derivative liabilities 4.7  
Interest rate contracts | Fair value measured on recurring basis | Level 1 Inputs    
Liabilities:    
Gross derivative liabilities 0.0  
Interest rate contracts | Fair value measured on recurring basis | Level 2 Inputs    
Liabilities:    
Gross derivative liabilities 4.7  
Interest rate contracts | Fair value measured on recurring basis | Level 3 Inputs    
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 10.8 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 10.8 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