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Debt Obligations - Additional Information (Details) |  | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 22, 2017 USD ($) Tranche | Sep. 30, 2017 GBP (£) | Nov. 01, 2017 USD ($) | Oct. 20, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 HKD | Jul. 25, 2017 GBP (£) | Apr. 01, 2017 USD ($) | Apr. 01, 2017 HKD | Dec. 31, 2016 USD ($) | Dec. 31, 2016 HKD
Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Bridge loan | £ |  | £ 344,200,000 |  |  |  |  | £ 1,115,000,000.000 |  |  |  |
Senior Unsecured Revolving Credit Facility | 2017 Credit Facility | Federal funds effective rate |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate margin | 0.50% |  |  |  |  |  |  |  |  |  |
Senior Unsecured Revolving Credit Facility | 2017 Credit Facility | FRBNY rate |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate margin | 0.50% |  |  |  |  |  |  |  |  |  |
Senior Unsecured Revolving Credit Facility | 2017 Credit Facility | One-Month LIBOR |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate margin | 1.00% |  |  |  |  |  |  |  |  |  |
Senior Unsecured Revolving Credit Facility | 2017 Credit Facility | Canadian Prime Rate |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate margin | 1.00% |  |  |  |  |  |  |  |  |  |
Senior Unsecured Revolving Credit Facility | 2017 Credit Facility | One-month CDOR |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate margin | 0.10% |  |  |  |  |  |  |  |  |  |
Senior Unsecured Revolving Credit Facility | HK Credit Facility | Line of credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) |  |  |  |  |  |  |  |  |  | $ 12,800,000 | HKD 100,000,000.0
Line of credit, current obligations |  |  |  |  | $ 0 |  |  | $ 5,800,000 | HKD 45,000,000 |  |
Amount available for future borrowings |  |  |  |  | 11,300,000 | HKD 88,200,000 |  |  |  |  |
Minimum commitment, amount | HKD |  |  |  |  |  |  |  |  |  |  | 5,000,000
Senior Unsecured Revolving Credit Facility | HK Credit Facility | HIBOR | Line of credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  | 1.50% |  |  |  |  |  |  |  |  |
Senior Unsecured Revolving Credit Facility | HK Credit Facility, Bank Guarantees | Line of credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Bank guarantees supported by facility |  |  |  |  | 1,500,000 | HKD 11,800,000 |  |  |  |  |
Stand-by Letters of Credit | 2017 Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letter of credit outstanding |  |  |  |  | 11,300,000 |  |  |  |  |  |
Business Card Facility | HK Credit Facility | Line of credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) |  |  |  |  |  |  |  |  |  | $ 100,000 | HKD 400,000.0
Line of credit | Senior Unsecured Revolving Credit Facility | 2017 Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initiation date | Aug. 22, 2017 |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Expiration date | Aug. 22, 2022 |  |  |  |  |  |  |  |  |  |
Adjusted leverage ratio (no greater than) | 3.5 |  |  |  |  |  |  |  |  |  |
Line of credit, current obligations |  |  |  |  | 0 |  |  |  |  |  |
Amount available for future borrowings |  |  |  |  | $ 988,700,000 |  |  |  |  |  |
Line of credit | Senior Unsecured Revolving Credit Facility | 2017 Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.10% |  |  |  |  |  |  |  |  |  |
Line of credit | Senior Unsecured Revolving Credit Facility | 2017 Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.25% |  |  |  |  |  |  |  |  |  |
Line of credit | Senior Unsecured Revolving Credit Facility | 2015 Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit, current obligations |  |  |  |  |  |  |  | $ 127,300,000.0 |  |  |
Line of credit | Letter of Credit | 2017 Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | $ 75,000,000 |  |  |  |  |  |  |  |  |  |
Line of credit | Bridge loan | 2017 Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | 50,000,000 |  |  |  |  |  |  |  |  |  |
Unsecured debt | Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Number of loan tranches | Tranche | 2 |  |  |  |  |  |  |  |  |  |
Additional maximum borrowing capacity | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |
Periodic payment percentage | 2.50% |  |  |  |  |  |  |  |  |  |
Unsecured debt | Term Loan Facility | Third anniversary of initial borrowing |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | $ 600,000,000.0 |  |  |  |  |  |  |  |  |  |
Unsecured debt | Term Loan Facility | Fifth anniversary of initial borrowing |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |
Unsecured debt | Term Loan Facility | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.10% |  |  |  |  |  |  |  |  |  |
Unsecured debt | Term Loan Facility | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.25% |  |  |  |  |  |  |  |  |  |
Subsequent event | Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Bridge loan |  |  |  | $ 0 |  |  |  |  |  |  |
Subsequent event | Senior notes | 4.00% Senior Notes |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 450,000,000.0 |  |  |  |  |  |  |
Stated interest rate percentage |  |  |  | 4.00% |  |  |  |  |  |  |
Subsequent event | Unsecured debt | Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |

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