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Short And Long-Term Debt Senior Secured Credit Facility (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019		Dec. 31, 2018	Feb. 28, 2018	Jan. 31, 2017	Mar. 05, 2013
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 3,472,000,000
Letter of Credit, borrowing capacity		$ 125
Additional Credit Facilities							$ 500,000,000
Maximum | Required Covenant Ratio to Receive Additional Credit Facilities
Debt Instrument [Line Items]
Senior secured leverage ratio		3.50
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 | 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			$ 1,400,000,000	$ 1,050,000,000
Line of Credit Facility, Increase (Decrease), Net	$ 25,000,000
Line of Credit | Revolving Credit Facility | Greater than 3.50 to 1.00 | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate		2.50%
Line of Credit | Revolving Credit Facility | Greater than 3.50 to 1.00 | ABR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate		1.50%
Line of Credit | Revolving Credit Facility | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate		2.25%
Line of Credit | Revolving Credit Facility | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 | ABR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate		1.25%
Line of Credit | Revolving Credit Facility | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00 | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate		2.00%
Line of Credit | Revolving Credit Facility | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00 | ABR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate		1.00%
Line of Credit | Revolving Credit Facility | Less than 2.00 to 1.00 | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate		1.75%
Line of Credit | Revolving Credit Facility | Less than 2.00 to 1.00 | ABR
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		$ 1,058,000,000	[1]	$ 1,069,000,000	$ 1,080,000,000
Annual percentage of original principal amount for quarterly amortization payments		1.00%
[1] The Term Loan B 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 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%).

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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-Subparagraph (b)(1)
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Amount of increase (decrease) of the credit facility.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Indebtedness divided by net capital.

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