CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Real estate income, net:
Rental income	$ 258.4	$ 245.9
Real estate property level expenses and taxes:
Operating expenses	55.3	57.6
Real estate taxes	42.5	38.1
Interest expense	22.5	17.4
Total real estate property level expenses and taxes	120.3	113.1
Real estate income, net	138.1	132.8
Income from real estate joint ventures and limited partnerships	45.9	27.8
Interest	9.7	5.0
Dividends	(0.7)	3.2
TOTAL INVESTMENT INCOME	193.0	168.8
Expenses:
Investment management charges	20.5	14.4
Administrative charges	15.6	17.3
Distribution charges	7.2	6.7
Mortality and expense risk charges	0.3	0.3
Liquidity guarantee charges	10.2	8.4
TOTAL EXPENSES	53.8	47.1
INVESTMENT INCOME, NET	139.2	121.7
Net realized gain (loss) on investments:
Real estate properties	(17.2)	8.3
Marketable securities	4.6	14.0
Net realized gain (loss) on investments	(12.6)	22.3
Net change in unrealized appreciation (depreciation) on:
Real estate properties	51.8	92.3
Real estate joint ventures and limited partnerships	61.0	145.8
Marketable securities	23.3	43.3
Mortgage loans payable	11.6	(1.6)
Net change in unrealized appreciation on investments and mortgage loans payable	147.7	279.8
NET REALIZED AND UNREALIZED GAIN ON INVESTMENTS AND MORTGAGE LOANS PAYABLE	135.1	302.1
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS	$ 274.3	$ 423.8