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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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