CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities
Net Income (Loss)	$ 804.1	$ 274.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	7.1	(90.6)
Change in Deferred Acquisition Costs	36.1	73.2
Change in Insurance Reserves and Liabilities	302.6	1,101.6
Change in Income Taxes	215.3	(106.9)
Change in Other Accrued Liabilities	(29.9)	25.0
Non-cash Components of Net Investment Income	(178.9)	(120.9)
Net Realized Investment Gain (Loss)	32.4	(1.9)
Depreciation	82.6	74.9
Other, Net	57.6	1.2
Net Cash Provided by Operating Activities	1,256.8	1,083.5
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	862.5	456.2
Proceeds from Maturities of Fixed Maturity Securities	1,392.3	2,234.9
Proceeds from Sales and Maturities of Other Investments	272.0	350.6
Purchases of Fixed Maturity Securities	(2,866.9)	(2,840.0)
Purchases of Other Investments	(354.9)	(448.5)
Net Purchases of Short-term Investments	(306.2)	(87.0)
Net Decrease in Payables for Collateral on Investments	(97.5)	(158.0)
Net Purchases of Property and Equipment	(107.5)	(95.6)
Other, Net	(0.3)	0.0
Net Cash Used by Investing Activities	(1,205.9)	(587.4)
Cash Flows from Financing Activities
Short-term Debt Repayments	0.0	(200.0)
Issuance of Long-term Debt	841.9	290.7
Long-term Debt Repayments	(381.5)	(45.0)
Cost Related to Early Retirement of Debt	(24.1)	0.0
Issuance of Common Stock	4.7	3.6
Repurchase of Common Stock	(297.2)	(205.8)
Dividends Paid to Stockholders	(170.3)	(160.2)
Other, Net	(41.4)	(42.6)
Net Cash Used by Financing Activities	(67.9)	(359.3)
Net Increase in Cash and Bank Deposits	(17.0)	136.8
Cash and Bank Deposits at Beginning of Year	94.0	77.4
Cash and Bank Deposits at End of Period	$ 77.0	$ 214.2