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Subsequent Events (Details) $ / shares in Units, $ in Thousands | May 07, 2019 USD ($) | May 03, 2019 $ / shares | May 03, 2019 EUR (€) shares | Mar. 31, 2019 £ / shares | Mar. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2019 EUR (€) shares | Mar. 31, 2018 £ / shares shares | Aug. 09, 2016 USD ($) | Dec. 31, 2015 shares
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Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Distributable profits | $ |  |  |  |  | $ 6,338,536 |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  |  |  |  | $ 300,000 |
Common Stock, Par or Stated Value Per Share | (per share) |  | $ 0.001 |  |  | $ 75.00 |  | £ 0.10 |  |
Preferred Stock, Shares Authorized |  |  |  |  | 50,000,000 | 50,000,000 | 100,000 |  |
Preferred Stock, Par or Stated Value Per Share | (per share) |  |  |  | £ 0.001 | $ 0.001 |  | £ 0.10 |  |
Deferred Ordinary Shares |  |  |  |  | 25,000 | 25,000 |  |  |
Preferred Stock, Shares Issued |  |  |  |  | 0 | 0 | 100,000 |  | 100,000
Equity [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ | $ 80,000 |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  | 0.001 |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  | 50,000,000 |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.001 |  |  |  |  |  |  |
Deferred Ordinary Shares |  |  | 25,000 |  |  |  |  |  |
Common Stock, Shares Authorized |  |  | 500,000,000 |  |  |  |  |  |
Euro Member Countries, Euro |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Par Value (Euros) of Deferred Ordinary Shares | € |  |  |  |  |  | € 1.00 |  |  |
Euro Member Countries, Euro | Equity [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Par Value (Euros) of Deferred Ordinary Shares | € |  |  | € 1.00 |  |  |  |  |  |

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- Definition Distributable profits + References No definition available. + Details
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