CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
FROM OPERATIONS
Investment income, net	$ 139.2	$ 121.7
Net realized gain (loss) on investments	(12.6)	22.3
Net change in unrealized appreciation on investments and mortgage loans payable	147.7	279.8
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS	274.3	423.8
FROM PARTICIPANT TRANSACTIONS
Premiums	779.5	758.2
Annuity payments	(10.9)	(9.9)
Withdrawals and death benefits	(699.9)	(502.2)
NET INCREASE IN NET ASSETS RESULTING FROM PARTICIPANT TRANSACTIONS	68.7	246.1
NET INCREASE IN NET ASSETS	343.0	669.9
NET ASSETS
Beginning of period	24,304.7	22,360.0
End of period	$ 24,647.7	$ 23,029.9