Long-term Debt (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Borrowings
Unamortized discount, debt issuance costs and other	$ (18,400,000)	$ (18,700,000)
Total long term-debt	2,081,600,000	2,081,300,000
Current portion of debt	1,200,000	1,100,000
Total long-term debt, net of current portion	2,080,400,000	2,080,200,000
Letters of credit outstanding	26,600,000	25,200,000
Revolving credit facility
Borrowings
Revolving credit facility	0	0
Availability under revolving line of credit	1,000,000,000.0	1,000,000,000.0
2.75% senior notes due 2030
Borrowings
Long-term debt, carrying amount	$ 750,000,000.0	$ 750,000,000.0
Interest rate (as a percent)	2.75%	2.75%
2.75% senior notes due 2030 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 780,300,000	$ 804,800,000
3.75% senior notes due 2027
Borrowings
Long-term debt, carrying amount	$ 600,000,000.0	$ 600,000,000.0
Interest rate (as a percent)	3.75%	3.75%
3.75% senior notes due 2027 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 664,100,000	$ 679,300,000
3.5% senior notes due 2024
Borrowings
Long-term debt, carrying amount	$ 400,000,000.0	$ 400,000,000.0
Interest rate (as a percent)	3.50%	3.50%
3.5% senior notes due 2024 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 428,500,000	$ 438,300,000
3.75% senior notes due 2022
Borrowings
Long-term debt, carrying amount	$ 350,000,000.0	$ 350,000,000.0
Interest rate (as a percent)	3.75%	3.75%
3.75% senior notes due 2022 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 364,000,000.0	$ 366,900,000
Revolving credit facility \| Letter of credit
Borrowings
Availability under revolving line of credit	53,400,000
Maximum borrowing capacity	$ 80,000,000.0

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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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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No definition available.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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