CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities
Net Income	$ 153.0	$ 161.0
Adjustments to Reconcile Net Income to Net Cash Provided (Used) by Operating Activities
Change in Receivables	4.5	(8.7)
Change in Deferred Acquisition Costs	35.8	14.2
Change in Insurance Reserves and Liabilities	291.1	67.5
Change in Income Taxes	44.9	24.9
Change in Other Accrued Liabilities	(72.4)	(121.3)
Non-cash Components of Net Investment Income	(108.0)	(92.5)
Net Realized Investment (Gain) Loss	(84.6)	144.0
Depreciation	29.3	28.5
Cash Related to Reinsurance Agreement	(456.8)	0.0
Other, Net	1.2	2.3
Net Cash Provided (Used) by Operating Activities	(162.0)	219.9
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	157.4	120.7
Proceeds from Maturities of Fixed Maturity Securities	856.3	414.3
Proceeds from Sales and Maturities of Other Investments	68.2	48.5
Purchases of Fixed Maturity Securities	(1,185.0)	(780.5)
Purchases of Other Investments	(62.5)	(144.2)
Net Sales and Maturities of Short-term Investments	769.0	15.5
Net Increase in Payables for Collateral on Investments	16.1	487.4
Net Purchases of Property and Equipment	(30.9)	(39.1)
Net Cash Provided by Investing Activities	588.6	122.6
Cash Flows from Financing Activities
Long-term Debt Repayment	0.0	(15.0)
Issuance of Common Stock	0.8	1.3
Dividends Paid to Stockholders	(58.4)	(57.8)
Cash Received Related to Active Life Volatility Cover Agreement	17.9	0.0
Other, Net	(22.1)	(17.9)
Net Cash Used by Financing Activities	(61.8)	(89.4)
Net Increase in Cash and Bank Deposits	364.8	253.1
Cash and Bank Deposits at Beginning of Year	197.0	84.1
Cash and Bank Deposits at End of Period	$ 561.8	$ 337.2