Debt And Liquidity (2020 Senior Notes) (Details) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2023
Debt Instrument [Line Items]
Debt Instrument, Event Of Default, Percentage Of Debt Held	30.00%
Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500
Debt Instrument, Covenant, Restricted Payments Allowable With No Default Or Event Of Default, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum	2.00
Debt Instrument, Covenant, Restricted Payments Allowable Pursuant To Certain Baskets, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum	2.00
Debt Instrument, Interest Rate, Stated Percentage		4.625%
Secured Debt | Prior to December 15, 2023
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	40.00%	40.00%
Redemption price related to net cash proceeds of certain equity offerings	104.625%
Debt Instrument, Redemption Price, Premium Applicable, Percentage	100.00%