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Debt And Interest Expense Debt and Interest Expense (Senior Notes) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | Dec. 06, 2028 |
Debt Instrument, Face Amount | $ 1,800.0 | $ 1,800.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | (9.8) | (12.1)
Senior Notes | $ 1,790.2 | 1,787.9
Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Offering Date | Mar. 27, 2015 |
Debt Instrument, Maturity Date | Apr. 01, 2025 |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |
Debt Instrument, Face Amount | $ 500.0 | 500.0
Due 2027 |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Offering Date | Jul. 05, 2017 |
Debt Instrument, Maturity Date | Jul. 15, 2027 |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |
Debt Instrument, Face Amount | $ 550.0 | 550.0
Due 2031 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Offering Date | Jun. 08, 2021 |
Debt Instrument, Maturity Date | Jun. 15, 2031 |
Debt Instrument, Interest Rate, Stated Percentage | 2.70% |
Debt Instrument, Face Amount | $ 750.0 | $ 750.0

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