Fair Value Measurements - Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Assets:
Gross derivative assets	$ 1,177.1	$ 1,347.4
Liabilities:
Gross derivative liabilities	1,212.4	1,490.8
Fair value measured on recurring basis
Assets:
Total assets at fair value	1,192.2	1,361.8
Liabilities:
Total liabilities at fair value	1,212.4	1,490.8
Fair value measured on recurring basis | Level 1 Inputs
Assets:
Total assets at fair value	496.5	496.2
Liabilities:
Total liabilities at fair value	537.4	497.4
Fair value measured on recurring basis | Level 2 Inputs
Assets:
Total assets at fair value	690.9	861.4
Liabilities:
Total liabilities at fair value	672.8	989.9
Fair value measured on recurring basis | Level 3 Inputs
Assets:
Total assets at fair value	4.8	4.2
Liabilities:
Total liabilities at fair value	2.2	3.4
Commodity contracts | Fair value measured on recurring basis
Assets:
Gross derivative assets	1,129.5	1,298.0
Liabilities:
Gross derivative liabilities	1,189.4	1,452.1
Commodity contracts | Fair value measured on recurring basis | Level 1 Inputs
Assets:
Gross derivative assets	496.5	496.2
Liabilities:
Gross derivative liabilities	537.4	497.4
Commodity contracts | Fair value measured on recurring basis | Level 2 Inputs
Assets:
Gross derivative assets	628.2	797.6
Liabilities:
Gross derivative liabilities	649.7	951.2
Commodity contracts | Fair value measured on recurring basis | Level 3 Inputs
Assets:
Gross derivative assets	4.8	4.2
Liabilities:
Gross derivative liabilities	2.2	3.4
Interest rate contracts | Fair value measured on recurring basis
Assets:
Gross derivative assets	20.7	24.7
Interest rate contracts | Fair value measured on recurring basis | Level 1 Inputs
Assets:
Gross derivative assets	0.0	0.0
Interest rate contracts | Fair value measured on recurring basis | Level 2 Inputs
Assets:
Gross derivative assets	20.7	24.7
Interest rate contracts | Fair value measured on recurring basis | Level 3 Inputs
Assets:
Gross derivative assets	0.0	0.0
Foreign currency contracts | Fair value measured on recurring basis
Assets:
Gross derivative assets	26.8	24.7
Liabilities:
Gross derivative liabilities	23.0	38.7
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	26.8	24.7
Liabilities:
Gross derivative liabilities	23.0	38.7
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
Cash surrender value of life insurance | Fair value measured on recurring basis
Assets:
Cash surrender value of life insurance	15.2	14.4
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	15.2	14.4
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