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Borrowings - Outstanding Debt Obligations (Details) £ in Millions, $ in Millions | Mar. 31, 2023 USD ($) | Mar. 31, 2023 CAD ($) | Mar. 31, 2023 EUR (€) | Mar. 31, 2023 GBP (£) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 GBP (£) | Sep. 30, 2021 USD ($) | Jul. 23, 2021 USD ($) | Apr. 27, 2021 USD ($) | Mar. 16, 2021 USD ($) | Dec. 01, 2020 USD ($) | Oct. 23, 2020 USD ($) | Jul. 15, 2020 USD ($)
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | $ 6,550,000,000 |  |  |  | $ 6,550,000,000 |  |  |  |  |  |  |  |  |  |
Outstanding Principal | 5,484,594,000 |  |  |  | 5,563,003,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 5,451,854,000 |  |  |  | 5,527,715,000 |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Costs | 32,740,000 |  |  |  | 35,289,000 |  |  |  |  |  |  |  |  |  |
Unused Portion | 1,065,406,000 |  |  |  | 986,997,000 |  |  |  |  |  |  |  |  |  |
Amount Available | 1,065,406,000 |  |  |  | 976,379,000 |  |  |  |  |  |  |  |  |  |
Jackson Hole Funding Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | 400,000,000 |  |  |  | 400,000,000 |  | € 0 |  |  |  |  |  |  |  |
Outstanding Principal | 360,019,000 |  |  |  | 360,019,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 360,019,000 |  |  |  | 360,019,000 |  |  |  |  |  |  |  |  |  |
Unused Portion | 39,981,000 |  |  |  | 39,981,000 |  |  |  |  |  |  |  |  |  |
Amount Available | 39,981,000 |  |  |  | 39,981,000 |  |  |  |  |  |  |  |  |  |
Breckenridge Funding Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | 825,000,000 |  |  |  | 825,000,000 |  |  |  |  |  |  |  |  |  |
Outstanding Principal | 809,500,000 |  |  |  | 825,000,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 809,500,000 |  |  |  | 825,000,000 |  |  |  |  |  |  |  |  |  |
Unused Portion | 15,500,000 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Amount Available | 15,500,000 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Big Sky Funding Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | 500,000,000 |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |
Outstanding Principal | 499,606,000 |  |  |  | 499,606,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 499,606,000 |  |  |  | 499,606,000 |  |  |  |  |  |  |  |  |  |
Unused Portion | 394,000 |  |  |  | 394,000 |  |  |  |  |  |  |  |  |  |
Amount Available | 394,000 |  |  |  | 394,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | 1,625,000,000 | $ 274.9 | € 97,900,000 | £ 65.4 | 1,625,000,000 | $ 355.9 | € 97,900,000 | £ 66.6 |  |  |  |  |  |  |
Outstanding Principal | 615,469,000 |  |  |  | 678,378,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 615,469,000 |  |  |  | 678,378,000 |  |  |  |  |  |  |  |  |  |
Unused Portion | 1,009,531,000 |  |  |  | 946,622,000 |  |  |  |  |  |  |  |  |  |
Amount Available | 1,009,531,000 |  |  |  | 936,004,000 |  |  |  |  |  |  |  |  |  |
3.650% Notes Due 2023 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | 400,000,000 |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  | $ 400,000,000
Outstanding Principal | 400,000,000 |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 399,381,000 |  |  |  | 398,850,000 |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Costs | 619,000 |  |  |  | 1,150,000 |  |  |  |  |  |  |  |  |  |
3.625% Notes Due 2026 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | 800,000,000 |  |  |  | 800,000,000 |  |  |  |  |  |  |  | $ 300,000,000 | $ 500,000,000 |
Outstanding Principal | 800,000,000 |  |  |  | 800,000,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 795,001,000 |  |  |  | 794,559,000 |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Costs | 4,999,000 |  |  |  | 5,441,000 |  |  |  |  |  |  |  |  |  |
2.750% Notes Due 2026 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | 700,000,000 |  |  |  | 700,000,000 |  |  |  |  |  | $ 300,000,000 | $ 400,000,000 |  |  |
Outstanding Principal | 700,000,000 |  |  |  | 700,000,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 693,868,000 |  |  |  | 693,432,000 |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Costs | 6,132,000 |  |  |  | 6,568,000 |  |  |  |  |  |  |  |  |  |
2.125% Senior Notes Due 2027 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | 650,000,000 |  |  |  | 650,000,000 |  |  |  |  | $ 650,000,000 |  |  |  |  |
Outstanding Principal | 650,000,000 |  |  |  | 650,000,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 639,346,000 |  |  |  | 638,669,000 |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Costs | 10,654,000 |  |  |  | 11,332,000 |  |  |  |  |  |  |  |  |  |
2.850% Notes Due 2028 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Principal Committed | 650,000,000 |  |  |  | 650,000,000 |  |  |  | $ 650,000,000 |  |  |  |  |  |
Outstanding Principal | 650,000,000 |  |  |  | 650,000,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 639,664,000 |  |  |  | 639,202,000 |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Costs | $ 10,336,000 |  |  |  | $ 10,798,000 |  |  |  |  |  |  |  |  |  |

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