Long-Term Debt - Schedule Of Long-Term Debt Instruments (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Unsecured Senior Notes \| $600 million 3.125% - due November 30, 2022
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.125%
Debt instrument, face amount	$ 600,000,000
Unsecured Senior Notes \| $600 million 4.000% - due January 30, 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.00%
Debt instrument, face amount	$ 600,000,000
Unsecured Senior Notes \| $500 million 3.750% - due January 15, 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.75%
Debt instrument, face amount	$ 500,000,000
Unsecured Senior Notes \| $400 million 5.375% - due November 30, 2043
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.375%
Debt instrument, face amount	$ 400,000,000
Carrying Value
Debt Instrument [Line Items]
Long-term debt	2,083,200,000	$ 2,082,600,000
Carrying Value \| Unsecured Senior Notes \| $600 million 3.125% - due November 30, 2022
Debt Instrument [Line Items]
Long-term debt	598,900,000	598,700,000
Carrying Value \| Unsecured Senior Notes \| $600 million 4.000% - due January 30, 2024
Debt Instrument [Line Items]
Long-term debt	597,000,000.0	596,800,000
Carrying Value \| Unsecured Senior Notes \| $500 million 3.750% - due January 15, 2026
Debt Instrument [Line Items]
Long-term debt	496,900,000	496,700,000
Carrying Value \| Unsecured Senior Notes \| $400 million 5.375% - due November 30, 2043
Debt Instrument [Line Items]
Long-term debt	390,400,000	390,400,000
Carrying Value \| $1.5 billion floating rate credit facility expiring August 11, 2022 (1)
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	0	0
Fair Value
Debt Instrument [Line Items]
Long-term debt	2,329,600,000	2,375,700,000
Fair Value \| Unsecured Senior Notes \| $600 million 3.125% - due November 30, 2022
Debt Instrument [Line Items]
Long-term debt	626,300,000	632,900,000
Fair Value \| Unsecured Senior Notes \| $600 million 4.000% - due January 30, 2024
Debt Instrument [Line Items]
Long-term debt	655,800,000	660,200,000
Fair Value \| Unsecured Senior Notes \| $500 million 3.750% - due January 15, 2026
Debt Instrument [Line Items]
Long-term debt	550,200,000	564,800,000
Fair Value \| Unsecured Senior Notes \| $400 million 5.375% - due November 30, 2043
Debt Instrument [Line Items]
Long-term debt	497,300,000	517,800,000
Fair Value \| $1.5 billion floating rate credit facility expiring August 11, 2022 (1)
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 0	$ 0

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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Contractual interest rate for funds borrowed, under the debt agreement.

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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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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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