^It seems like the Riverstone deal has two components.
First, there is 'value' recognition (although this value was deserved to start with if you think runoff operations are worth it).
Second, this was a liquidity operation. The 599.5M flowed to holdco (in a quarter when holdco was sending capital to insurance subs) in exchange for assets contributed to the Barbados-based joint venture. OMERS is participating for a price: the present value of the deconsolidated non-controlling interest. This is reminiscent of the Northbride and OdysseyRe bi-directional (sell then buy higher) operations (which were opportunities for profitable trades from an outsider perspective). There is a schedule for Fairfax to buy back the interest over time.
It was opportunistic but it is what it is.