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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities      
Net income (loss) $ 1,757.4 $ 1,428.5 $ 1,444.1
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Net realized capital (gains) losses (2.5) (302.6) 52.8
Depreciation and amortization expense 275.3 251.9 226.8
Amortization of deferred acquisition costs and contract costs 317.8 412.9 371.4
Additions to deferred acquisition costs and contract costs (518.7) (499.9) (515.5)
Stock-based compensation 96.1 87.6 82.6
(Income) loss from equity method investments, net of dividends received (166.3) (10.6) (111.9)
Changes in:      
Accrued investment income 13.8 (24.0) (50.4)
Net cash flows for trading securities and equity securities with operating intent 99.9 144.2 (53.8)
Premiums due and other receivables (100.9) 16.4 (247.6)
Contractholder and policyholder liabilities and dividends 1,363.5 1,591.2 3,599.9
Current and deferred income taxes (benefits) 160.2 442.5 211.2
Real estate acquired through operating activities (73.7) (16.4) (64.7)
Real estate sold through operating activities 1.8 195.5 136.1
Other assets and liabilities 10.4 (89.0) 401.1
Other (15.3) 110.4 11.1
Net adjustments 1,461.4 2,310.1 4,049.1
Net cash provided by (used in) operating activities 3,218.8 3,738.6 5,493.2
Investing activities      
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases (16,625.5) (15,713.4) (14,137.1)
Fixed maturities available-for-sale and equity securities with intent to hold: Sales 2,735.3 3,043.9 2,397.4
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities 10,960.0 8,819.5 7,064.2
Mortgage loans acquired or originated (5,223.5) (3,249.5) (3,487.7)
Mortgage loans sold or repaid 2,853.2 2,477.2 2,335.9
Real estate acquired (281.4) (230.6) (127.5)
Real estate sold 133.7 2.3 96.3
Net (purchases) sales of property and equipment (129.9) (108.8) (132.4)
Purchase of business or interests in subsidiaries, net of cash acquired     (1,208.5)
Sale of interests in subsidiaries 27.0    
Net change in other investments (107.0) (66.4) (489.1)
Net cash provided by (used in) investing activities (5,658.1) (5,025.8) (7,688.5)
Financing activities      
Issuance of common stock 86.7 42.8 37.7
Acquisition of treasury stock (937.2) (307.0) (281.0)
Payments for financing element derivatives (39.9) (30.9) (26.9)
Purchase of subsidiary shares from noncontrolling interest (24.2) (1.4) (1.7)
Dividends to common stockholders (654.1) (614.5) (606.0)
Issuance of long-term debt   608.9 504.9
Principal repayments of long-term debt (1.8) (65.8) (32.2)
Net proceeds from (repayments of) short-term borrowings 10.2 (12.6) 57.5
Investment contract deposits 9,359.8 10,284.4 9,200.0
Investment contract withdrawals (8,801.0) (8,852.7) (7,747.7)
Net increase (decrease) in banking operation deposits 2,922.9 569.7 623.4
Other 0.1 0.2 5.7
Net cash provided by (used in) financing activities 1,921.5 1,621.1 1,733.7
Net increase (decrease) in cash and cash equivalents (517.8) 333.9 (461.6)
Cash and cash equivalents at beginning of period 2,849.8 2,515.9 2,977.5
Cash and cash equivalents at end of period 2,332.0 2,849.8 2,515.9
Supplemental information:      
Cash paid for interest 166.1 162.8 157.7
Cash paid for (received from) income taxes 109.9 (172.0) (8.5)
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 accumulated other comprehensive income ("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)    
Lease assets established upon adoption of accounting guidance     168.8
Lease liabilities established upon adoption of accounting guidance     164.0
Assets received in kind from pension risk transfer transactions $ 109.5 $ 1,325.2 $ 1,225.8