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Short And Long-Term Debt Senior Secured Credit Facility (Details) $ in Millions | 3 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Feb. 05, 2021 USD ($) | Jan. 27, 2021 USD ($) | Jan. 11, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jul. 24, 2020 | Jun. 30, 2020 | Feb. 28, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt principal amount |  | $ 3,231 |  |  |  |  |  |  |  |
Senior secured leverage ratio |  | 0.64 |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital Denominator |  | 1.00 |  |  |  |  |  |  |  |
Letter of Credit, borrowing capacity |  | $ 125 |  |  |  |  |  |  |  |
Maximum | Required Covenant Ratio from December 2020 to June 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  | 5.25 |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital Denominator |  | 1.00 |  |  |  |  |  |  |  |
Maximum | Required Covenant Ratio from July 2021 to March 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  | 5.00 |  |  |  |  |
Ratio of Indebtedness to Net Capital Denominator |  |  |  |  | 1.00 |  |  |  |  |
Maximum | Required Covenant Ratio from April 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  | 4.75 |  |  |  |  |
Ratio of Indebtedness to Net Capital Denominator |  |  |  |  | 1.00 |  |  |  |  |
Maximum | Suggested Covenant Ratio compliance for additional covenants under 2021 Amendment until June 30, 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  | 5.00 |  |  |  |  |
Ratio of Indebtedness to Net Capital Denominator |  |  |  |  | 1.00 |  |  |  |  |
Maximum | Suggested Covenant Ratio compliance for additional covenants under 2020 Amendment from July 24 2020 to June 30, 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  |  |  |  | 5.50 |  |
Ratio of Indebtedness to Net Capital Denominator |  |  |  |  |  |  |  | 1.00 |  |
Maximum | Required Covenant Ratio for election by Company to end the amended covenant period under 2021 Amendment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  | 4.75 |  |  |  |  |
Ratio of Indebtedness to Net Capital Denominator |  |  |  |  | 1.00 |  |  |  |  |
Maximum | Required Covenant Ratio |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  |  |  |  |  | 4.75 |
Ratio of Indebtedness to Net Capital Denominator |  |  |  |  |  |  |  |  | 1.00 |
LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Description of variable interest rate basis |  | LIBOR |  |  |  |  |  |  |  |
ABR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Description of variable interest rate basis |  | ABR |  |  |  |  |  |  |  |
Term Loan B |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  | $ (655) |  |  |  |  |  |
Term Loan B | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate, Floor |  | 0.75% |  |  |  |  |  |  |  |
Term Loan B | ABR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate, Floor |  | 1.75% |  |  |  |  |  |  |  |
Line of Credit | Extended Revolving Credit Commitment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  | $ 948 |  |  | $ 948 |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  | $ 1,425 |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | LIBOR | Greater than 3.50 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | LIBOR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | LIBOR | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | LIBOR | Less than 2.00 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | ABR | Greater than 3.50 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | ABR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | ABR | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00% |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | ABR | Less than 2.00 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |  |  |  |  |  |  |
Line of Credit | Non-extended Revolving Credit Commitment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity | [1] | $ 477 |  |  |  |  |  |  |  |
Secured Debt | Term Loan A |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  | (250) |  |  |  |  |  |
Long-term debt principal amount |  |  |  |  |  | $ 434 |  |  |  | $ 750
Secured Debt | Term Loan A | LIBOR | Greater than 3.50 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |  |  |  |  |  |  |  |
Secured Debt | Term Loan A | LIBOR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |  |  |  |  |
Secured Debt | Term Loan A | LIBOR | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |  |  |  |  |  |
Secured Debt | Term Loan A | LIBOR | Less than 2.00 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |  |  |  |  |  |
Secured Debt | Term Loan A | ABR | Greater than 3.50 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |  |  |  |  |
Secured Debt | Term Loan A | ABR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |  |  |  |  |  |
Secured Debt | Term Loan A | ABR | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00% |  |  |  |  |  |  |  |
Secured Debt | Term Loan A | ABR | Less than 2.00 to 1.00 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |  |  |  |  |  |  |
Secured Debt | Term Loan B |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt principal amount |  | $ 390 | [2] |  |  |  | $ 1,048 |  |  | $ 1,080
Annual percentage of original principal amount for quarterly amortization payments |  | 1.00% |  |  |  |  |  |  |  |
Secured Debt | Extended Term Loan A |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt principal amount |  | $ 237 | [3],[4] |  | $ 237 |  | 0 |  |  |
Senior Notes | 5.75% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt principal amount |  | $ 900 |  | $ 900 |  |  | $ 0 |  |  |
Interest Rate |  | 5.75% |  |  |  |  |  |  |  |
[1] | Interest rates with respect to revolving loans under the Senior Secured Credit Facility at March 31, 2021 were based on, at the Company's option, (a) adjusted London Interbank Offering Rate ("LIBOR") plus an additional margin or (b) JP Morgan Chase Bank, N.A.'s prime rate ("ABR") plus an additional margin, in each case subject to adjustment based on the then current senior secured leverage ratio. Based on the previous quarter's senior secured leverage ratio, the LIBOR margin was 1.75% and the ABR margin was 0.75% for the three months ended March 31, 2021.
[2] | In January and February 2021, we used a portion of the proceeds from the issuance of 5.75% Senior Notes to pay down $655 million of outstanding borrowings under the Term Loan B Facility. The Term Loan B Facility provides for quarterly amortization payments totaling 1% per annum of the $1,080 million original principal amount. The interest rate with respect to term loans under the Term Loan B Facility is based on, at the Company’s option, (a) adjusted LIBOR plus 2.25% (with a LIBOR floor of 0.75%) or (b) ABR plus 1.25% (with an ABR floor of 1.75%). On April 28, 2021, the Company used cash on hand to pay down $150 million of the Term Loan B Facility.
[3] | In January 2021, prior to the effective date of the 2021 Amendments, we used a portion of the proceeds from the issuance of 5.75% Senior Notes to pay down $250 million of outstanding borrowings under the Term Loan A Facility. The interest rates with respect to each of the Non-extended Term Loan A and Extended Term Loan A are based on, at the Company's option, (a) adjusted LIBOR plus an additional margin or (b) ABR plus an additional margin, in each case subject to adjustment based on the then current senior secured leverage ratio. Based on the previous quarter's senior secured leverage ratio, the LIBOR margin was 1.75% and the ABR margin was 0.75% for the three months ended March 31, 2021.
[4] | The Extended Term Loan A has quarterly amortization payments, commencing with the quarter ending June 30, 2021, equal to a percentage per quarter of the $237 million principal amount of the Extended Term Loan A outstanding on January 27, 2021 (the effective date of the 2021 Amendments), as follows: 0.625% per quarter from June 30, 2021 to March 31, 2022; 1.25% per quarter from June 30, 2022 to March 31, 2023; 1.875% per quarter from June 30, 2023 to March 31, 2024; and 2.50% per quarter for periods ending on or after June 30, 2024, with the balance of the Extended Term Loan A due at maturity on February 8, 2025.

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