CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
FROM OPERATIONS
Investment income, net	$ 208.4	$ 200.6	$ 380.8	$ 380.5
Net realized gain on investments	63.3	59.3	209.4	50.7
Net change in unrealized appreciation on investments and mortgage loans payable	77.0	145.5	201.3	209.1
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS	348.7	405.4	791.5	640.3
FROM PARTICIPANT TRANSACTIONS
Premiums	671.1	603.6	1,348.5	1,272.7
Annuity payments	(11.9)	(11.2)	(23.4)	(22.4)
Withdrawals and death benefits	(597.0)	(571.2)	(1,226.6)	(1,532.7)
NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM PARTICIPANT TRANSACTIONS	62.2	21.2	98.5	(282.4)
NET INCREASE IN NET ASSETS	410.9	426.6	890.0	357.9
NET ASSETS
Beginning of period	26,321.7	24,873.9	25,842.6	24,942.6
End of period	$ 26,732.6	$ 25,300.5	$ 26,732.6	$ 25,300.5