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Debt and Credit Agreements - Narrative (Details) |  | 1 Months Ended | 12 Months Ended
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Apr. 22, 2019 USD ($) | Jan. 31, 2021 USD ($) | May 31, 2016 USD ($) | Sep. 30, 2014 USD ($) Tranche Investor | Dec. 31, 2010 USD ($) Investor Tranche | Jul. 31, 2008 USD ($) Tranche Investor | Dec. 31, 2020 USD ($) fiscal_period | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt maturities, due in 2021 |  |  |  |  |  |  | $ 188,000,000.0 |  |
Debt maturities, due in 2023 |  |  |  |  |  |  | 62,000,000.0 |  |
Debt maturities, due in 2024 |  |  |  |  |  |  | 575,000,000.0 |  |
Repayments of debt |  |  |  |  |  |  | 283,000,000 | $ 102,000,000 | $ 455,000,000
Deferred financing costs capitalized |  |  |  |  |  |  | $ 3,076,000 | 3,975,000 |
Unamortized discount |  |  |  |  |  |  |  | 3,400,000 |
6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  | 6.51% |  |
Long-term debt |  |  |  |  |  |  | $ 37,000,000 | 124,000,000 |
5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  | 5.58% |  |
Long-term debt |  |  |  |  |  |  | $ 175,000,000 | 175,000,000 |
3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  | 3.65% |  |
Long-term debt |  |  |  |  |  |  | $ 925,000,000 | 925,000,000 |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum required asset coverage ratio |  |  |  |  |  |  | 1.75 |  |
Fiscal quarters for reduction in coverage ratio | fiscal_period |  |  |  |  |  |  | 4 |  |
Minimum required annual coverage ratio |  |  |  |  |  |  | 2.8 |  |
Maximum borrowing capacity on line of credit | $ 3,200,000,000 |  |  |  |  |  |  |  |
Remaining borrowing capacity on line of credit | $ 1,500,000,000 |  |  |  |  |  | $ 1,500,000,000 |  |
Minimum current ratio |  |  |  |  |  |  | 1.0 |  |
Long-term debt |  |  |  |  |  |  | $ 0 | $ 0 |
Interest rate |  |  |  |  |  |  | 4.00% | 6.30% |
Subsequent Event | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  | $ 88,000,000.0 |  |  |  |  |  |  |
Weighted-average interest rate |  | 5.58% |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum required asset coverage ratio |  |  |  |  |  |  | 1.75 |  |
Fiscal quarters for reduction in coverage ratio | fiscal_period |  |  |  |  |  |  | 4 |  |
Minimum required annual coverage ratio |  |  |  |  |  |  | 2.8 |  |
Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  | $ 425,000,000.0 |  |  |
Number of institutional investors | Investor |  |  |  |  |  | 41 |  |  |
Number of debt tranches | Tranche |  |  |  |  |  | 3 |  |  |
Repayments of debt |  |  |  |  |  |  | $ 388,000,000.0 |  |
Senior Notes | 5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | $ 175,000,000.0 |  |  |  |
Number of institutional investors | Investor |  |  |  |  | 8 |  |  |  |
Number of debt tranches | Tranche |  |  |  |  | 3 |  |  |  |
Senior Notes | 3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  | $ 925,000,000.0 |  |  |  |  |
Number of institutional investors | Investor |  |  |  | 24 |  |  |  |  |
Number of debt tranches | Tranche |  |  |  | 3 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 0 |  |
Deferred financing costs capitalized |  |  |  |  |  |  |  | $ 7,400,000 |
Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  | $ 64,000,000.0 |  |  |  |  |  |
Repayments of debt |  |  | 68,300,000 |  |  |  |  |  |
Tranche 1 | Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  | $ 245,000,000 |  |  |
Tranche 1 | Senior Notes | 5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | $ 88,000,000 |  |  |  |
Tranche 1 | Senior Notes | 3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  | $ 100,000,000 |  |  |  |  |
Tranche 1 | Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  | 8,000,000.0 |  |  |  |  |  |
Tranche 2 | Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  | 100,000,000 |  |  |
Tranche 2 | Senior Notes | 5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | 25,000,000 |  |  |  |
Tranche 2 | Senior Notes | 3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  | 575,000,000 |  |  |  |  |
Tranche 2 | Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  | 13,000,000.0 |  |  |  |  |  |
Tranche 3 | Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  | $ 80,000,000 |  |  |
Tranche 3 | Senior Notes | 5.58% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | $ 62,000,000 |  |  |  |
Tranche 3 | Senior Notes | 3.65% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  | $ 250,000,000 |  |  |  |  |
Tranche 3 | Senior Notes | 6.51% Weighted-average Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  |  | $ 43,000,000.0 |  |  |  |  |  |
External Credit Rating, Non Investment Grade | Minimum | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage | 30.00% |  |  |  |  |  |  |  |
External Credit Rating, Non Investment Grade | Minimum | Revolving Credit Facility | ABR Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 50.00% |  |  |  |  |  |  |  |
External Credit Rating, Non Investment Grade | Minimum | Revolving Credit Facility | LIBOR Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 150.00% |  |  |  |  |  |  |  |
External Credit Rating, Non Investment Grade | Maximum | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage | 42.50% |  |  |  |  |  |  |  |
External Credit Rating, Non Investment Grade | Maximum | Revolving Credit Facility | ABR Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 125.00% |  |  |  |  |  |  |  |
External Credit Rating, Non Investment Grade | Maximum | Revolving Credit Facility | LIBOR Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 225.00% |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade | Minimum | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage | 12.50% |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade | Minimum | Revolving Credit Facility | ABR Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 12.50% |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade | Minimum | Revolving Credit Facility | LIBOR Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 112.50% |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade | Maximum | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage | 27.50% |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade | Maximum | Revolving Credit Facility | ABR Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 75.00% |  |  |  |  |  |  |  |
External Credit Rating, Investment Grade | Maximum | Revolving Credit Facility | LIBOR Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 175.00% |  |  |  |  |  |  |  |

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