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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities    
Net cash provided by (used in) operating activities $ 140.8 $ 1,589.1
Investing activities    
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases (3,867.6) (3,190.1)
Fixed maturities available-for-sale and equity securities with intent to hold: Sales 704.4 582.4
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities 3,058.0 1,984.1
Mortgage loans acquired or originated (1,368.4) (827.3)
Mortgage loans sold or repaid 551.1 581.6
Real estate acquired (42.4) (39.6)
Net (purchases) sales of property and equipment (22.9) (18.0)
Net change in other investments (31.4) 14.2
Net cash provided by (used in) investing activities (1,019.2) (912.7)
Financing activities    
Issuance of common stock 17.3 9.0
Acquisition of treasury stock (115.5) (231.8)
Payments for financing element derivatives (8.8) (7.1)
Purchase of subsidiary shares from noncontrolling interest (16.6) (0.9)
Dividends to common stockholders (152.2) (153.6)
Principal repayments of long-term debt (0.4) (64.5)
Net proceeds from (repayments of) short-term borrowings 0.2 24.6
Investment contract deposits 2,350.2 2,725.7
Investment contract withdrawals (2,183.6) (2,255.6)
Net increase (decrease) in banking operation deposits 141.5 244.5
Other   0.1
Net cash provided by (used in) financing activities 32.1 290.4
Net increase (decrease) in cash and cash equivalents (846.3) 966.8
Cash and cash equivalents at beginning of period 2,849.8 2,515.9
Cash and cash equivalents at end of period 2,003.5 3,482.7
Changes from re-designation of other postretirement employee benefits ("OPEB") plan assets to cover non-retiree benefits:    
Increases in equity securities re-designated from funded status of OPEB plan 548.1  
Increases in other investments re-designated from funded status of OPEB plan 117.5  
Decrease in tax receivable re-designated from funded status of OPEB plan (9.1)  
Decrease in AOCI due to reclassifying excess assets out of funded status of OPEB plan 9.1  
Decrease in other assets due to reclassifying excess assets out of funded status of OPEB plan $ (665.6)  
Assets received in kind from pension risk transfer transactions   $ 909.6