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Other Assets - Narrative (Details) - 1 months ended Mar. 31, 2017 - Four Seasons £ in Millions, $ in Millions | USD ($) | GBP (£) | GBP (£)
--- | --- | --- | ---
Other assets |  |  |
Marketable debt security, par value |  |  | £ 138.5
Marketable debt security, par value, discounted | $ 101 |  | 83.0
Market debt security, carrying value | 50 |  | £ 41.0
Other income, net |  |  |
Other assets |  |  |
Gain on sale | $ 51 | £ 42.0 |

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