Long-term Debt (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Borrowings
Unamortized discount, debt issuance costs and other	$ (17,800,000)	$ (18,700,000)
Total long term-debt	2,082,200,000	2,081,300,000
Current portion of debt	1,200,000	1,100,000
Total long-term debt, net of current portion	2,081,000,000.0	2,080,200,000
Letters of credit outstanding	27,100,000	25,200,000
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	$ 754,800,000	$ 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	$ 666,200,000	$ 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	$ 432,300,000	$ 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	$ 364,700,000	$ 366,900,000
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
Letter of credit \| Credit Agreement
Borrowings
Availability under revolving line of credit	53,000,000.0
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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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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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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