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Debt - Additional Information (Details) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 13, 2017 | Sep. 05, 2014 | Oct. 22, 2013 | Jun. 26, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 18, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net proceeds used to repay outstanding debt | $ 997,800,000 |  |  |  |  | $ 997,800,000 | $ 385,000,000 |
Annual Principal Maturities for Debt [Abstract] |  |  |  |  |  |  |  |
2019 |  |  |  |  | $ 0 |  |  |
2020 |  |  |  |  | 500,000,000 |  |  |
2021 |  |  |  |  | 0 |  |  |
2022 |  |  |  |  | 400,000,000 |  |  |
2023 and thereafter |  |  |  |  | 1,600,000,000 |  |  |
Interest payments |  |  |  |  | 97,000,000 | 96,300,000 |  |
Interest payments and redemption premium payments paid for debt obligations |  |  |  |  |  |  | 88,300,000 |
Amortization of net (loss) gain on treasury lock |  |  |  |  | (5,300,000) | (5,700,000) | (5,700,000) |
Amortization of financing costs |  |  |  |  | 2,700,000 | 4,000,000 | 1,800,000 |
Write-off of deferred debt issuance costs |  |  |  |  |  | $ 1,800,000 |  |
Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Remaining net proceeds used to pay debt issuance costs | 6,800,000 |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  | $ 350,000,000
Unused borrowing capacity |  |  |  |  | 326,900,000 |  |  |
Line of Credit | Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  | $ 23,100,000 |  |  |
2.45% Senior Notes, due December 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 2.45% |  |
2.45% Senior Notes, due December 2020 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, face amount | $ 500,000,000 |  |  |  |  |  |  |
Stated interest rate | 2.45% |  |  |  | 2.45% | 2.45% |  |
Debt instrument, maturity date | Dec. 15, 2020 |  |  |  | Dec. 15, 2020 | Dec. 15, 2020 |  |
3.40% Senior Notes, due December 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 3.40% |  |
3.40% Senior Notes, due December 2027 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, face amount | $ 500,000,000 |  |  |  |  |  |  |
Stated interest rate | 3.40% |  |  |  | 3.40% | 3.40% |  |
Debt instrument, maturity date | Dec. 15, 2027 |  |  |  | Dec. 15, 2027 | Dec. 15, 2027 |  |
Seven-Year Term Loan, due October 2020 | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of debt | $ 625,600,000 |  |  |  |  |  |  |
Five-Year Term Loan, due August 2021 | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of debt | $ 350,400,000 |  |  |  |  |  |  |
Five-Year and Seven-Year Term Loans, due October 2018 and 2020, respectively | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  | $ 1,650,000,000
3.90% Senior Notes, due June 2022 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, face amount |  |  |  | $ 400,000,000 |  |  |  |
Stated interest rate |  |  |  | 3.90% | 3.90% | 3.90% |  |
Debt instrument, maturity date |  |  |  | Jun. 15, 2022 | Jun. 15, 2022 | Jun. 15, 2022 |  |
4.50% Senior Notes, due November 2023 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, face amount |  |  | $ 700,000,000 |  |  |  |  |
Stated interest rate |  |  | 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 |  |  |  |  |  |
Stated interest rate |  | 3.65% |  |  | 3.65% | 3.65% |  |
Debt instrument, maturity date |  | Sep. 15, 2024 |  |  | Sep. 15, 2024 | Sep. 15, 2024 |  |
Fixed-Rate Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Book value of fixed rate debt |  |  |  |  | $ 2,496,300,000 |  |  |
Long-term debt (fixed-rate debt), fair value |  |  |  |  | $ 2,468,800,000 |  |  |
6.50% Senior Notes due March 2018 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 6.50% | 6.50% |  |
Repayment of debt |  |  |  |  | $ 150,000,000 |  |  |
Debt instrument, maturity date |  |  |  |  | Mar. 15, 2018 | Mar. 15, 2018 |  |
Term Loan | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  | $ 1,000,000,000 | $ 36,300,000 |

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