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Parent Company Cash Flow Statement (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Cash Flow Statements, Captions      
Cash Provided by Operating Activities $ 1,387.5 $ 469.3 $ 1,606.6
Cash Flows from Investing Activities      
Proceeds from Maturities of Fixed Maturity Securities 2,611.4 2,052.4 2,401.0
Proceeds from Sales and Maturities of Other Investments 403.1 237.0 363.5
Purchase of Other Investments (606.8) (440.6) (568.5)
Net Sales (Purchases) of Short-term Investments 76.5 (133.1) (267.6)
Net Purchases of Property and Equipment (110.3) (119.1) (150.9)
Cash Used by Investing Activities (1,340.6) (267.7) (1,393.5)
Cash Flows from Financing Activities      
Short-term Debt Repayment 0.0 (400.0) 0.0
Issuance of Long-term Debt 588.1 494.1 841.9
Long-term Debt Repayment (500.0) (80.0) (493.1)
Cost Related to Early Retirement of Debt 62.8 0.0 25.9
Issuance of Common Stock 3.4 4.4 6.1
Repurchase of Common Stock (50.0) 0.0 (400.3)
Dividends Paid to Stockholders (239.4) (231.9) (229.2)
Other, Net 4.0 (1.5) (3.7)
Cash Used by Financing Activities (168.9) (88.7) (223.0)
Net Increase (Decrease) in Cash and Bank Deposits (122.0) 112.9 (9.9)
Parent Company      
Condensed Cash Flow Statements, Captions      
Cash Provided by Operating Activities 861.0 964.0 1,000.0
Cash Flows from Investing Activities      
Proceeds from Maturities of Fixed Maturity Securities 245.5 138.8 16.6
Proceeds from Sales and Maturities of Other Investments 20.1 46.6 5.6
Purchase of Fixed Maturity Securities (2.0) (384.7) 0.0
Purchase of Other Investments (0.9) (22.0) 0.0
Net Sales (Purchases) of Short-term Investments (465.0) 440.6 (309.0)
Cash Distributions to Subsidiaries (300.9) (965.5) (389.0)
Net Purchases of Property and Equipment (91.3) (81.6) (85.9)
Cash Used by Investing Activities (594.5) (827.8) (761.7)
Cash Flows from Financing Activities      
Short-term Debt Repayment 0.0 (400.0) 0.0
Issuance of Long-term Debt 588.1 494.1 841.9
Long-term Debt Repayment (500.0) 0.0 (433.1)
Cost Related to Early Retirement of Debt 62.8 0.0 25.9
Issuance of Common Stock 3.4 4.4 6.1
Repurchase of Common Stock (50.0) 0.0 (400.3)
Dividends Paid to Stockholders (239.4) (231.9) (229.2)
Other, Net (1.6) (1.4) (3.7)
Cash Used by Financing Activities (262.3) (134.8) (244.2)
Net Increase (Decrease) in Cash and Bank Deposits $ 4.2 $ 1.4 $ (5.9)