CONSOLIDATED STATEMENT OF CASH FLOWS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 129.2	$ 42.0	$ 190.0	$ 131.4
Adjustments to reconcile net income to net cash from operating activities:
Amortization and depreciation			218.8	183.7
Income taxes			(2.3)	38.8
Insurance liabilities			263.9	462.5
Accrual and amortization of investment income			(26.0)	(150.1)
Deferral of policy acquisition costs			(201.5)	(217.5)
Net realized investment (gains) losses			55.4	(23.7)
Loss on extinguishment of debt	$ 0.0	$ 0.0	0.0	7.3
Other			43.5	78.5
Net cash from operating activities			541.8	510.9
Amounts related to employee benefit plans			$ 17.5	$ 14.7