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Short And Long-Term Debt Term Loan A Facility (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Feb. 28, 2018	Jul. 20, 2016	Oct. 23, 2015	Mar. 05, 2013
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 93
Long-term Debt, Gross	$ 3,472,000,000
Additional Credit Facilities							$ 500,000,000
Maximum | Required Covenant Ratio to Receive Additional Credit Facilities
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	3.50
Ratio of Indebtedness to Net Capital Denominator	1.00
Secured Debt | Term Loan A
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount						$ 435,000,000
Long-term Debt, Gross	$ 717,000,000		$ 736,000,000	$ 750,000,000
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 A | 2018
Debt Instrument [Line Items]
Annual percentage of original principal amount for quarterly amortization payments	2.50%
Secured Debt | Term Loan A | 2019
Debt Instrument [Line Items]
Annual percentage of original principal amount for quarterly amortization payments	2.50%
Secured Debt | Term Loan A | 2020
Debt Instrument [Line Items]
Annual percentage of original principal amount for quarterly amortization payments	5.00%
Secured Debt | Term Loan A | 2021
Debt Instrument [Line Items]
Annual percentage of original principal amount for quarterly amortization payments	7.50%
Secured Debt | Term Loan A | 2022
Debt Instrument [Line Items]
Annual percentage of original principal amount for quarterly amortization payments	10.00%
Secured Debt | Term Loan A-1
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount					$ 355,000,000
Secured Debt | Term Loan A Facility
Debt Instrument [Line Items]
Additional Credit Facilities						$ 500,000,000
Secured Debt | Term Loan A Facility | Maximum | Required Covenant Ratio to Receive Additional Credit Facilities
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	350.00%
Ratio of Indebtedness to Net Capital Denominator	100.00%

X

- Definition

The amount of additional credit facilities permitted to be obtained by the Company under the Amended and Restated Credit Agreement if the Company's senior secured leverage ratio is less than 3.50 to 1.00 on a pro forma basis.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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