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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/presentationRef
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-SubTopic 10
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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments including both interest and principal payments.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

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Debt (Term Loans Under The Senior Credit Agreement) (Narrative) (Details) - USD ($)			12 Months Ended
	Jan. 20, 2017	Nov. 18, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Repayment of term loans			$ 20,000,000	$ 20,000,000	$ 190,000,000
Debt instrument, principal balance			9,405,000,000	8,875,000,000
2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 200,000,000
Debt instrument, maturity date			May 09, 2017
Deferred financing fees			$ 2,700,000
Repayment of term loans		$ 160,000,000			$ 172,500,000
Write-off of deferred financing fees		$ 800,000
2014 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 1,500,000,000
Debt instrument, maturity date			Mar. 24, 2021
Coupon rate of notes			3.82%
Percentage of par value price for issuance of term loan			99.75%
Deferred financing fees			$ 14,100,000
Quarterly payments			3,800,000
Repayment of term loans			15,000,000
Debt instrument, principal balance			1,447,500,000	1,462,500,000
2015 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 500,000,000
Debt instrument, maturity date			Jun. 10, 2022
Term Loan, percentage of par value			99.00%
Coupon rate of notes			3.82%
Deferred financing fees			$ 5,500,000
Quarterly payments			1,300,000
Repayment of term loans			5,000,000
Debt instrument, principal balance			$ 487,500,000	$ 492,500,000
Base Rate [Member] \| 2014 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate			1.50%
Base rate floor			1.75%
Base Rate [Member] \| 2015 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate			1.50%
Base rate floor			1.75%
Base Rate [Member] \| Term Loan under the Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	1.25%
Base rate floor	0.00%
Eurodollar [Member] \| 2014 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate			2.50%
Eurodollar rate floor			0.75%
Eurodollar [Member] \| 2015 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate			2.50%
Eurodollar rate floor			0.75%
Eurodollar [Member] \| Term Loan under the Senior Credit Agreement [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	2.25%
Eurodollar rate floor	0.00%
Minimum [Member] \| Base Rate [Member] \| 2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate			1.00%
Minimum [Member] \| Eurodollar [Member] \| 2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate			2.00%
Maximum [Member] \| Base Rate [Member] \| 2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate			1.50%
Maximum [Member] \| Eurodollar [Member] \| 2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate			2.50%