Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Amount of amortization expense attributable to debt issuance costs.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Debt - Long-term Borrowings (Details) - USD ($)	12 Months Ended
Debt - Long-term Borrowings (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2016	Apr. 30, 2016	Jul. 28, 2015
Additional Debt (Textual) [Abstract]
Maturities of long-term debt 2017	$ 701,679,000
Maturities of long-term debt 2018	754,000
Maturities of long-term debt 2019	248,000
Maturities of long-term debt 2020	252,000
Maturities of long-term debt 2021	256,000
Interest expense on long-term debt	75,509,000	$ 54,634,000	$ 56,408,000
Debt (Textual) [Abstract]
Borrowing outstanding	0	0	0
Amortization of credit facility and debt issuance costs	63,759,000	$ 3,096,000	$ 3,224,000
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Interest Rate Contract [Member]
Debt (Textual) [Abstract]
Notional amount of interest rate locks				$ 3,575,000,000
Derivative pretax gain recognized in OCI	137,233,000
Other Current Assets [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Interest Rate Contract [Member]
Debt (Textual) [Abstract]
Interest rate lock asset	137,233,000
Line of Credit [Member] \| Interest Expense [Member]
Debt (Textual) [Abstract]
Amortization of credit facility and debt issuance costs	61,104,000
Periodic fees	11,740,000
Line of Credit [Member] \| Other Current Assets [Member]
Debt (Textual) [Abstract]
Debt issuance costs	65,100,000
Bridge Credit Agreement [Member] \| Line of Credit [Member] \| Bridge Loan [Member]
Debt (Textual) [Abstract]
Maximum borrowing capacity					$ 7,300,000,000
Borrowing outstanding	$ 0
Senior Notes [Member] \| 3.45 % Senior notes due 2025 [Member]
Debt (Textual) [Abstract]
Face amount						$ 400,000,000
Interest rate (percentage)	3.45%					3.45%
Senior Notes [Member] \| 4.55% Senior notes due 2045 [Member]
Debt (Textual) [Abstract]
Face amount						$ 400,000,000
Interest rate (percentage)	4.55%					4.55%
Line of Credit [Member] \| Term Credit Agreement [Member]
Debt (Textual) [Abstract]
Maximum borrowing capacity					$ 2,000,000,000