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v3.20.4

Debt - Additional Information (Details) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 23, 2019 | Dec. 06, 2019 | Nov. 21, 2019 | Dec. 13, 2017 | Sep. 05, 2014 | Oct. 22, 2013 | Nov. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  |  |  |  | $ 0 |  |
2022 |  |  |  |  |  |  |  |  | 0 |  |
2023 |  |  |  |  |  |  |  |  | 700,000,000.0 |  |
2024 |  |  |  |  |  |  |  |  | 400,000,000.0 |  |
2025 and thereafter |  |  |  |  |  |  |  |  | 1,400,000,000 |  |
Interest payments |  |  |  |  |  |  |  |  | 97,000,000.0 | $ 114,000,000.0 | $ 97,000,000.0
Amortization of net (loss) gain on treasury lock |  |  |  |  |  |  |  |  |  | (18,200,000) | (5,300,000)
Amortization of financing costs |  |  |  |  |  |  |  |  | 2,000,000.0 | $ 4,500,000 | $ 2,700,000
Write-off of deferred debt issuance costs |  |  |  |  |  |  | $ 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) |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  | 8,300,000 |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  | 350,000,000.0 |  |
Unused borrowing capacity |  |  |  |  |  |  |  |  | 326,300,000 |  |
Line of Credit | Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  | $ 23,700,000 |  |
3.00% Senior Notes, due December 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 3.00% |  | 3.00% |
3.00% Senior Notes, due December 2029 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  | $ 500,000,000.0 |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.00% |  |  |  |  | 3.00% | 3.00% | 3.00% |
Debt instrument, maturity date |  |  | Dec. 15, 2029 |  |  |  |  |  | Dec. 15, 2029 | Dec. 15, 2029 |
4.05% Senior Notes, due December 2049 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 4.05% |  | 4.05% |
4.05% Senior Notes, due December 2049 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.05% |  |  |  |  | 4.05% | 4.05% | 4.05% |
Debt instrument, maturity date |  |  | Dec. 15, 2049 |  |  |  |  |  | Dec. 15, 2049 | Dec. 15, 2049 |
2.45% Senior Notes, due December 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 2.45% |  | 2.45% |
Debt instrument, redemption amount included premiums, accrued and unpaid interest |  |  |  |  |  |  |  | $ 509,700,000 |  | $ 509,700,000 |
2.45% Senior Notes, due December 2020 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  | $ 500,000,000.0 |  |  |  |  |  |  |  |
Stated interest rate |  | 2.45% | 2.45% |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | Dec. 15, 2020 |  |  |  |  |  |  |  |
Debt instrument, redemption amount |  | $ 509,700,000 |  |  |  |  |  |  |  |  |
Debt instrument, redemption premium |  | 3,800,000 |  |  |  |  |  |  |  |  |
Debt instrument, accrued and unpaid interest |  | $ 5,800,000 |  |  |  |  |  |  |  |  |
3.90% Senior Notes, due June 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 3.90% |  | 3.90% |
Debt instrument, redemption amount included premiums, accrued and unpaid interest |  |  |  |  |  |  |  | $ 418,700,000 |  | $ 418,700,000 |
3.90% Senior Notes, due June 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |
Stated interest rate | 3.90% |  | 3.90% |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | Jun. 15, 2022 |  |  |  |  |  |  |  |
Debt instrument, redeem date |  |  | 2019-12 |  |  |  |  |  |  |  |
Debt instrument, redemption amount | $ 418,700,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption premium | 18,400,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, accrued and unpaid interest | $ 300,000 |  |  |  |  |  |  |  |  |  |
4.50% Senior Notes, due November 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | $ 700,000,000.0 |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.50% |  | 4.50% | 4.50% | 4.50% |
Debt instrument, maturity date |  |  |  |  |  | Nov. 01, 2023 |  |  | Nov. 01, 2023 | Nov. 01, 2023 |
3.65% Senior Notes, due September 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  | $ 400,000,000.0 |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.65% |  |  | 3.65% | 3.65% | 3.65% |
Debt instrument, maturity date |  |  |  |  | Sep. 15, 2024 |  |  |  | Sep. 15, 2024 | Sep. 15, 2024 |
3.40% Senior Notes, due December 2027 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  | $ 500,000,000.0 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.40% |  |  |  | 3.40% | 3.40% | 3.40% |
Debt instrument, maturity date |  |  |  | Dec. 15, 2027 |  |  |  |  | Dec. 15, 2027 | Dec. 15, 2027 |
Fixed-Rate Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Book value of fixed rate debt |  |  |  |  |  |  |  |  | $ 2,493,700,000 |  |
Long-term debt (fixed-rate debt), fair value |  |  |  |  |  |  |  |  | 2,827,100,000 |  |
6.50% Senior Notes due March 2018 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 6.50%
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  | Mar. 15, 2018
Repayment of debt |  |  |  |  |  |  |  |  |  |  | $ 150,000,000.0
Redemption Premiums |  |  |  |  |  |  |  |  |  |  |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest payments |  |  |  |  |  |  |  |  | $ 22,200,000 |  |

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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. + References No definition available. + Details
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