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Debt And Liquidity (2020 Senior Notes) (Details) $ in Millions | 1 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2021
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% |
Redemption price related to net cash proceeds of certain equity offerings | 104.625% |
Debt Instrument, Redemption Price, Premium Applicable, Percentage | 100.00% |

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