Legal action could influence whether the European Commission approves the $30 billion acquisition.
The transaction will form the biggest insurance broker in the world.
Level rises to 85.8% for corporate plan funding, Aon says.
Falling bond yields prove too much for robust asset gains.
After a whirlwind day of news, Aon confirms it will not pursue the buyout after all.
The pension is now studying the impact of a 2% to 4% allocation to managed futures on the total fund.
Although most plans are now fully funded, solvency gains can vanish quickly, firm says.
Worldwide assets grow to $130 billion.