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Short And Long-Term Debt Senior Secured Credit Facility (Details) | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Feb. 05, 2021 USD ($) | Feb. 04, 2021 USD ($) | Jan. 27, 2021 | Jan. 11, 2021 USD ($) | Jul. 24, 2020 | Jun. 30, 2020 | Dec. 31, 2019 USD ($) | Feb. 28, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 3,239,000,000 |  |  |  |  |  |  |  |  |
Letter of Credit, borrowing capacity | $ 125 |  |  |  |  |  |  |  |  |
Senior secured leverage ratio | 1.70 |  |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital Denominator | 1.00 |  |  |  |  |  |  |  |  |
Required Covenant Ratio from October 2021 to June 2022 (2020 Amendment) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly Decrease of Ratio of Indebtedness to Net Capital |  |  |  |  |  |  | 0.25 |  |  |
Maximum | Required Covenant Ratio from July 2020 to June 2021 (2020 Amendment) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  |  |  | 6.50 |  |  |
Ratio of Indebtedness to Net Capital Denominator |  |  |  |  |  |  | 1.00 |  |  |
Maximum | Required Covenant Ratio from July 2021 to September 2021 (2020 Amendment) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  |  |  | 5.50 |  |  |
Ratio of Indebtedness to Net Capital Denominator |  |  |  |  |  |  | 1.00 |  |  |
Maximum | Required Covenant Ratio from April 2022 (2020 Amendment) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  |  |  | 4.75 |  |  |
Ratio of Indebtedness to Net Capital Denominator |  |  |  |  |  |  | 1.00 |  |  |
Maximum | Required Covenant Ratio from April 2022 (2020 Amendment) | Subsequent Event |  |  |  |  |  |  |  |  |  |
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 2020 Amendments 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 2020 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 |  |
Maximum | Required Covenant Ratio (2020 Amendment) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio | 6.50 |  |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital Denominator | 1.00 |  |  |  |  |  |  |  |  |
Maximum | Required Covenant Ratio (2021 Amendment) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio | 5.25 |  |  |  |  |  |  |  |  |
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 A | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  | $ (250,000,000) |  |  |  |  |  |  |
Term Loan B | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  | (655,000,000) |  |  |  |  |  |  |
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 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity | $ 1,425,000,000 |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
Secured Debt | Term Loan A |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 684,000,000 | [1] |  |  |  |  |  |  | $ 717,000,000 | $ 750,000,000
Secured Debt | Term Loan A | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | $ 434,000,000 |  |  |  |
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, Gross | $ 1,048,000,000 | [2] |  |  |  |  |  |  | $ 1,058,000,000 | $ 1,080,000,000
Annual percentage of original principal amount for quarterly amortization payments | 1.00% |  |  |  |  |  |  |  |  |
Senior Notes | 5.75% Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 900,000,000 | $ 300,000,000 |  | $ 600,000,000 |  |  |  |
Interest Rate |  |  |  |  |  | 5.75% |  |  |  |
[1] | The Term Loan A Facility provides for quarterly amortization payments, equal to a percentage of the original principal amount of the Term Loan A, as follows: 0.625% per quarter from June 30, 2018 to March 31, 2020; 1.25% per quarter from June 30, 2020 to March 31, 2021; 1.875% per quarter from June 30, 2021 to March 31, 2022; and 2.50% per quarter for periods ending on or after June 30, 2022, with the balance of the Term Loan A Facility due at maturity on February 8, 2023. The interest rates with respect to the Term Loan A Facility 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 2.00% and the ABR margin was 1.00% for the three months ended December 31, 2020. See Note 20, "Subsequent Events", for a description of the January and February issuances of 5.75% Senior Notes and amendments to the Senior Secured Credit Facility and Term Loan A Facility.
[2] | The Term Loan B Facility provides for quarterly amortization payments totaling 1% per annum of the 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%). See Note 20, "Subsequent Events", for a description of the January and February issuances of 5.75% Senior Notes and the January 2021 amendments to the Senior Secured Credit Facility and Term Loan A Facility.

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