Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net Cash Provided by (Used in) Operating Activities	$ 695.3	$ 31.5
Investing activities
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases	(3,874.5)	(5,413.1)
Fixed maturities available-for-sale and equity securities with intent to hold: Sales	1,714.5	4,358.9
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities	1,318.0	2,045.7
Mortgage loans acquired or originated	(318.2)	(1,191.9)
Mortgage loans sold or repaid	439.9	407.7
Real estate acquired	(41.2)	(86.8)
Real estate sold		71.6
Net (purchases) sales of property and equipment	(31.4)	(25.4)
Net change in other investments	(311.2)	(39.9)
Net cash provided by (used in) investing activities	(1,104.1)	126.8
Financing activities
Issuance of common stock	19.8	19.6
Accelerated share repurchase		(140.0)
Acquisition of treasury stock	(188.5)	(754.1)
Payments for financing element derivatives	(10.5)	(12.9)
Purchase of subsidiary shares from noncontrolling interest	(2.8)	(6.7)
Dividends to common stockholders	(155.5)	(167.0)
Issuance of long-term debt	691.5
Principal repayments of long-term debt	(0.6)	(0.5)
Net proceeds from (repayments of) short-term borrowings	(61.2)	193.2
Investment contract deposits	3,264.3	2,441.7
Investment contract withdrawals	(3,047.2)	(1,790.9)
Net increase (decrease) in banking operation deposits	(307.6)	468.5
Net cash provided by (used in) financing activities	201.7	250.9
Net increase (decrease) in cash and cash equivalents	(207.1)	409.2
Cash and cash equivalents at beginning of period	4,848.0	2,332.0
Cash and cash equivalents at end of period	$ 4,640.9	$ 2,741.2