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Debt - Additional Information (Details) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 08, 2021 | Sep. 21, 2021 | Nov. 21, 2019 | Dec. 13, 2017 | Sep. 05, 2014 | Oct. 22, 2013 | Sep. 30, 2021 | Nov. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemed Value of Notes |  |  |  |  |  |  |  |  |  | $ 2,491,000,000.0 | $ 2,493,700,000 |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  |  |  |  |  | 0 |  |  |
2023 |  |  |  |  |  |  |  |  |  | 0 |  |  |
2024 |  |  |  |  |  |  |  |  |  | 400,000,000.0 |  |  |
2025 |  |  |  |  |  |  |  |  |  | 0 |  |  |
2026 and thereafter |  |  |  |  |  |  |  |  |  | 2,100,000,000 |  |  |
Interest payments |  |  |  |  |  |  |  |  |  | 149,600,000 | 97,000,000.0 | $ 114,000,000.0 |
Estimated interest payments for 2022 |  |  |  |  |  |  |  |  |  | 84,700,000 |  |  |
Estimated interest payments for 2023 |  |  |  |  |  |  |  |  |  | 84,200,000 |  |  |
Estimated interest payments for 2024 |  |  |  |  |  |  |  |  |  | 84,200,000 |  |  |
Estimated interest payments for 2025 |  |  |  |  |  |  |  |  |  | 69,600,000 |  |  |
Estimated interest payments for 2026 |  |  |  |  |  |  |  |  |  | 1,000,000,000.0 |  |  |
Amortization of net (loss) gain on treasury lock |  |  |  |  |  |  |  |  |  |  |  | (18,200,000) |
Amortization of financing costs |  |  |  |  |  |  |  |  |  | 3,400,000 | 2,000,000.0 | $ 4,500,000 |
Write-off of deferred debt issuance costs |  |  |  |  |  |  | $ 1,400,000 | $ 1,800,000 |  |  |  |  |
Treasury Lock |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net (loss) gain on treasury lock |  |  |  |  |  |  |  | $ (13,100,000) | $ (13,100,000) |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemed Value of Notes |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Unused borrowing capacity |  |  |  |  |  |  |  |  |  | 323,200,000 |  |  |
Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemed Value of Notes |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |
Debt instrument, term |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  | Aug. 29, 2021 |  |  |
Debt instrument offering date |  |  |  |  |  |  |  |  |  | Jun. 08, 2021 |  |  |
3.00% Senior Notes, due December 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.00% |  |  | 3.00% |
Debt Instrument aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000 |
Debt instrument, redemption amount included premiums, accrued and unpaid interest |  |  |  |  |  |  |  |  | $ 928,400,000 |  |  | $ 928,400,000 |
3.00% Senior Notes, due December 2029 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |
Redeemed Value of Notes |  |  |  |  |  |  |  |  |  | $ 499,500,000 | $ 499,400,000 |  |
Stated interest rate |  |  | 3.00% |  |  |  |  |  |  | 3.00% | 3.00% |  |
Debt instrument, maturity date |  |  | Dec. 15, 2029 |  |  |  |  |  |  | Dec. 15, 2029 | Dec. 15, 2029 |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off unamortized debt discount |  |  |  |  |  |  |  |  |  | $ 500,000 | $ 600,000 |  |
4.05% Senior Notes, due December 2049 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 4.05% |  |  | 4.05% |
Debt Instrument aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000 |
Debt instrument, redemption amount included premiums, accrued and unpaid interest |  |  |  |  |  |  |  |  | $ 928,400,000 |  |  | $ 928,400,000 |
4.05% Senior Notes, due December 2049 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |
Redeemed Value of Notes |  |  |  |  |  |  |  |  |  | $ 396,600,000 | $ 396,600,000 |  |
Stated interest rate |  |  | 4.05% |  |  |  |  |  |  | 4.05% | 4.05% |  |
Debt instrument, maturity date |  |  | Dec. 15, 2049 |  |  |  |  |  |  | Dec. 15, 2049 | Dec. 15, 2049 |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off unamortized debt discount |  |  |  |  |  |  |  |  |  | $ 3,400,000 | $ 3,400,000 |  |
3.90% Senior Notes, due June 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.90% |  |  | 3.90% |
4.50% Senior Notes, due November 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.50%
Debt instrument, redemption amount included premiums, accrued and unpaid interest |  |  |  |  |  |  |  |  |  |  |  |  | $ 769,800,000
4.50% Senior Notes, due November 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  | $ 700,000,000.0 |  |  |  | $ 700,000,000.0 |  |  |  |  |  |  |
Redeemed Value of Notes |  |  |  |  |  |  |  |  |  |  | $ 699,400,000 |  |
Stated interest rate | 4.50% | 4.50% |  |  |  | 4.50% |  |  |  | 4.50% | 4.50% |  |
Debt instrument, maturity date |  | Nov. 01, 2023 |  |  |  | Nov. 01, 2023 |  |  |  | Nov. 01, 2023 | Nov. 01, 2023 |  |
Debt instrument, repurchase amount | $ 769,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption premium | 56,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, accrued and unpaid interest | 13,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off of deferred debt issuance costs | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Write-off unamortized debt discount | $ 500,000 |  |  |  |  |  |  |  |  |  | $ 600,000 |  |
3.65% Senior Notes, due September 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |
Redeemed Value of Notes |  |  |  |  |  |  |  |  |  | $ 399,600,000 | $ 399,500,000 |  |
Stated interest rate |  |  |  |  | 3.65% |  |  |  |  | 3.65% | 3.65% |  |
Debt instrument, maturity date |  |  |  |  | Sep. 15, 2024 |  |  |  |  | Sep. 15, 2024 | Sep. 15, 2024 |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off unamortized debt discount |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 500,000 |  |
3.40% Senior Notes, due December 2027 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  | $ 500,000,000.0 |  |  |  |  |  |  |  |  |
Redeemed Value of Notes |  |  |  |  |  |  |  |  |  | $ 499,000,000.0 | $ 498,800,000 |  |
Stated interest rate |  |  |  | 3.40% |  |  |  |  |  | 3.40% | 3.40% |  |
Debt instrument, maturity date |  |  |  | Dec. 15, 2027 |  |  |  |  |  | Dec. 15, 2027 | Dec. 15, 2027 |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off unamortized debt discount |  |  |  |  |  |  |  |  |  | $ 1,000,000.0 | $ 1,200,000 |  |
Fixed-Rate Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of fixed rate debt |  |  |  |  |  |  |  |  |  | 2,491,000,000.0 |  |  |
Long-term debt (fixed-rate debt), fair value |  |  |  |  |  |  |  |  |  | $ 2,650,100,000 |  |  |
3.05% Senior Notes, due December 2051 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  | $ 700,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.05% |  |  |  |  |  |  |  | 3.05% |  |  |
Debt instrument, maturity date |  | Dec. 31, 2051 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  | $ 7,700,000 |  |  |
3.05% Senior Notes, due October 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.05%
3.05% Senior Notes, due October 2021 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  | $ 700,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.05% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  | Oct. 01, 2051 |  |  |  |  |  |  |  |  |  |  |
Redemption Premiums |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payments |  |  |  |  |  |  |  |  |  | $ 56,100,000 |  | $ 22,200,000 |

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