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Long-Term Debt And Commercial Paper (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |
Letters of credit, amount outstanding | $ 0.8 |
Commercial paper, maximum aggregate amount outstanding permitted | 1,900.0 |
Commercial paper, amount outstanding | $ 285.0 | $ 440.0
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Weighted-average annual interest rate | 5.90% | 5.90%
Maximum | Commercial Paper |  |
Debt Instrument [Line Items] |  |
Maturity period of debt | 397 days |
Weighted Average | Commercial Paper |  |
Debt Instrument [Line Items] |  |
Maturity period of debt | 4 days | 6 days
Revolving Credit Facility Due 2028 |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity under revolving credit facility | $ 1,900.0 |
Additional borrowing capacity under accordion feature of revolving credit facility | 500.0 |
Revolving credit facilities letter of credit sublimit | 200.0 |
Additional borrowing capacity under the revolving credit facility | 1,900.0 |
Revolving Credit Facility Due 2028 | Recourse |  |
Debt Instrument [Line Items] |  |
Revolving credit facility, amount outstanding | $ 0.0 | $ 0.0
Revolving Credit Facility Due 2028 | Secured Overnight Financing Rate (SOFR) |  |
Debt Instrument [Line Items] |  |
Credit spread adjustment on SOFR borrowings under our revolving credit facility | 0.10% |
Revolving Credit Facility Due 2028 | Minimum |  |
Debt Instrument [Line Items] |  |
Commitment fee on undrawn amounts (percent) | 0.125% |
Revolving Credit Facility Due 2028 | Maximum |  |
Debt Instrument [Line Items] |  |
Commitment fee on undrawn amounts (percent) | 0.20% |
Other Debt | Recourse |  |
Debt Instrument [Line Items] |  |
Finance leases and other debt obligations included in long-term debt | $ 359.7 | $ 362.2
Line of Credit | Revolving Credit Facility Due 2028 | Recourse |  |
Debt Instrument [Line Items] |  |
Maturity date | Jul. 18, 2028 |
Line of Credit | Revolving Credit Facility Due 2028 | Minimum | Secured Overnight Financing Rate (SOFR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable interest rates (percent) | 1.125% |
Line of Credit | Revolving Credit Facility Due 2028 | Minimum | Base Rate |  |
Debt Instrument [Line Items] |  |
Basis spread on variable interest rates (percent) | 0.125% |
Line of Credit | Revolving Credit Facility Due 2028 | Maximum | Secured Overnight Financing Rate (SOFR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable interest rates (percent) | 1.50% |
Line of Credit | Revolving Credit Facility Due 2028 | Maximum | Base Rate |  |
Debt Instrument [Line Items] |  |
Basis spread on variable interest rates (percent) | 0.50% |

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