Debt And Interest Expense Debt and Interest Expense (Senior Notes) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Dec. 12, 2024
Debt Instrument, Face Amount	$ 1,800.0	$ 1,800.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(12.1)	(14.3)
Senior Notes	$ 1,787.9	1,785.7
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

Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Date the debt instrument was offered for sale, in YYYY-MM-DD format.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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