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Other Commitments and Contingencies (Contractual Obligation, Fiscal Year Maturity Schedule) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Long-term Purchase Commitment [Line Items] |  |
Long-term Debt, Future Minimum Payments Due | $ 9,455.0 |
Long-term Debt, Future Minimum Payments Due, Next Twelve Months | 0.0 |
Long-term Debt, Future Minimum Payments, Due in Two Years | 0.0 |
Long-term Debt, Future Minimum Payments, Due in Three Years | 1,260.0 |
Long-term Debt, Future Minimum Payments, Due in Four Years | 0.0 |
Long-term Debt, Future Minimum Payments, Due in Five Years | 1,090.0 |
Long-term Debt, Future Minimum Payments, Due Thereafter | 7,105.0 |
Interest Payments on Long-term Debt, Future Minimum Payments Due | 5,890.4 |
Interest Payments on Long-term Debt, Future Minimum Payments Due, Next Twelve Months | 351.6 |
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Two Years | 351.6 |
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Three Years | 351.6 |
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Four Years | 339.1 |
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Five Years | 319.7 |
Interest Payments on Long-term Debt, Future Minimum Payments, Due Thereafter | 4,176.8 |
Finance Leases, Future Minimum Payments Due | 226.5 |
Finance Leases, Future Minimum Payments Due, Next Twelve Months | 38.9 |
Finance Leases, Future Minimum Payments Due in Two Years | 30.9 |
Finance Leases, Future Minimum Payments Due in Three Years | 24.5 |
Finance Leases, Future Minimum Payments Due in Four Years | 19.4 |
Finance Leases, Future Minimum Payments Due in Five Years | 15.4 |
Finance Leases, Future Minimum Payments Due Thereafter | 97.4 |
Operating Leases, Future Minimum Payments Due | 43.3 |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 7.9 |
Operating Leases, Future Minimum Payments, Due in Two Years | 6.4 |
Operating Leases, Future Minimum Payments, Due in Three Years | 5.8 |
Operating Leases, Future Minimum Payments, Due in Four Years | 5.3 |
Operating Leases, Future Minimum Payments, Due in Five Years | 4.5 |
Operating Leases, Future Minimum Payments, Due Thereafter | 13.4 |
Energy Commodity Contracts, Future Minimum Payments Due | 231.7 |
Energy Commodity Contracts, Future Minimum Payments Due, Next Twelve Months | 119.7 |
Energy Commodity Contracts, Future Minimum Payments, Due in Two Years | 76.0 |
Energy Commodity Contracts, Future Minimum Payments, Due in Three Years | 36.0 |
Energy Commodity Contracts, Future Minimum Payments, Due in Four Years | 0.0 |
Energy Commodity Contracts, Future Minimum Payments, Due in Five Years | 0.0 |
Energy Commodity Contracts, Future Minimum Payments, Due Thereafter | 0.0 |
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due | 2,484.9 |
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due, Next Twelve Months | 642.2 |
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Two Years | 556.9 |
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Three Years | 410.5 |
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Four Years | 337.2 |
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Five Years | 328.8 |
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due Thereafter | 209.3 |
Service Obligations, IT Service Obligations, Future Minimum Payments Due | 177.4 |
Service Obligations, IT Service Obligations, Future Minimum Payments Due, Next Twelve Months | 71.9 |
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Two Years | 50.0 |
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Three Years | 41.3 |
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Four Years | 11.4 |
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Five Years | 2.8 |
Service Obligations, IT Service Obligations, Future Minimum Payments, Due Thereafter | 0.0 |
Other Liabilities, Future Minimum Payments Due | 654.2 |
Other Liabilities, Future Minimum Payments Due, Next Twelve Months | 612.5 |
Other Liabilities, Future Minimum Payments, Due in Two Years | 6.2 |
Other Liabilities, Future Minimum Payments, Due in Three Years | 5.9 |
Other Liabilities, Future Minimum Payments, Due in Four Years | 5.2 |
Other Liabilities, Future Minimum Payments, Due in Five Years | 5.2 |
Other Liabilities, Future Minimum Payments, Due Thereafter | 19.2 |
Total Future Contractual Obligations Due | 19,163.4 |
Total Future Contractual Obligations Due, Next Twelve Months | 1,844.7 |
Total Future Contractual Obligations, Due in Two Years | 1,078.0 |
Total Future Contractual Obligations, Due in Three Years | 2,135.6 |
Total Future Contractual Obligations, Due in Four Years | 717.6 |
Total Future Contractual Obligations, Due in Five Years | 1,766.4 |
Total Future Contractual Obligations, Due Thereafter | 11,621.1 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | (76.1) | $ (79.1)
Finance Lease, Liability, Undiscounted Excess Amount | (51.8) |
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | $ (6.6) |

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- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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