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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

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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.

+ References

No definition available.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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Weighted average interest rate of debt outstanding.

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

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 borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Debt - Additional Information (Detail)	9 Months Ended
Debt - Additional Information (Detail)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Aug. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)
Debt Instrument [Line Items]
Aggregate Debt Redemption		$ 1,659,300,000
unamortized deferred financing costs		$ 6,500,000
Debt, Long-term and Short-term, Combined Amount	$ 1,503,400,000		$ 4,279,200,000
Maximum
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	25.0
Costs and expenses incurred in connection with acquisition excluded from computation of Net Income figure used in our debt covenant calculation	$ 25,000,000
Debt agreement financial covenant, leverage ratio	1.00
EBITDA Ratio for Debt	3.00
Minimum
Debt Instrument [Line Items]
Debt Instrument, Fee Amount	$ 9.0
Debt agreement financial covenant, leverage ratio	3.5
EBITDA Ratio for Debt	1.00
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity				$ 2,500,000,000	$ 2,100,000,000
Remaining availability under Credit Facility	$ 2,366,800,000
Revolving Credit Facility [Member] \| Maximum
Debt Instrument [Line Items]
Remaining availability under Credit Facility	1,828,400,000
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial Paper	$ 116,000,000		398,700,000
Debt, Weighted Average Interest Rate	2.10%
Senior Notes [Member] \| Senior Notes 1.875% Due 2017
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 0		350,000,000
Debt, Weighted Average Interest Rate	1.875%
Senior Notes [Member] \| Senior Notes 2.900% Due 2018
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 255,300,000		500,000,000
Debt, Weighted Average Interest Rate	2.90%
Senior Notes [Member] \| Senior Notes 2.650% Due 2019
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 250,000,000		250,000,000
Debt, Weighted Average Interest Rate	2.65%
Senior Notes [Member] \| Senior Notes 2.45% Due 2019
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 587,300,000		520,700,000
Debt, Weighted Average Interest Rate	2.45%
Senior Notes [Member] \| Senior Notes 3.625% Due 2020
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 74,000,000		400,000,000
Debt, Weighted Average Interest Rate	3.625%
Senior Notes [Member] \| Senior Notes 5.000% Due 2021
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 103,800,000		500,000,000
Debt, Weighted Average Interest Rate	5.00%
Senior Notes [Member] \| Senior Notes 3.150% Due 2022
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 88,300,000		550,000,000
Debt, Weighted Average Interest Rate	3.15%
Senior Notes [Member] \| Senior Notes 4.65% Due 2025
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 19,300,000		$ 250,000,000
Debt, Weighted Average Interest Rate	4.65%
Other Credit Facilities
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 29,900,000
Line of credit facility, amount outstanding	$ 0