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Parent Company Cash Flow Statement (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Cash Flow Statements, Captions      
Cash Provided by Operating Activities $ 1,418.7 $ 1,387.5 $ 469.3
Cash Flows from Investing Activities      
Proceeds from Maturities of Fixed Maturity Securities 1,532.5 2,611.4 2,052.4
Proceeds from Sales and Maturities of Other Investments 445.9 403.1 237.0
Purchase of Fixed Maturity Securities (2,835.3) (4,106.3) (3,169.6)
Purchase of Other Investments (482.9) (606.8) (440.6)
Net Sales (Purchases) of Short-term Investments (22.6) 76.5 (133.1)
Net Purchases of Property and Equipment (102.2) (110.3) (119.1)
Cash Used by Investing Activities (955.9) (1,340.6) (267.7)
Cash Flows from Financing Activities      
Short-term Debt Repayment 0.0 0.0 (400.0)
Issuance of Long-term Debt 349.2 588.1 494.1
Long-term Debt Repayment (364.0) (500.0) (80.0)
Cost Related to Early Retirement of Debt 3.6 62.8 0.0
Issuance of Common Stock 4.0 3.4 4.4
Repurchase of Common Stock (200.1) (50.0) 0.0
Dividends Paid to Stockholders (254.2) (239.4) (231.9)
Other, Net (2.9) 4.0 (1.5)
Cash Used by Financing Activities (418.6) (168.9) (88.7)
Net Increase (Decrease) in Cash and Bank Deposits 44.2 (122.0) 112.9
Parent Company      
Condensed Cash Flow Statements, Captions      
Cash Provided by Operating Activities 1,250.2 861.0 964.0
Cash Flows from Investing Activities      
Proceeds from Maturities of Fixed Maturity Securities 192.1 245.5 138.8
Proceeds from Sales and Maturities of Other Investments 7.4 20.1 46.6
Purchase of Fixed Maturity Securities (102.7) (2.0) (384.7)
Purchase of Other Investments (32.0) (0.9) (22.0)
Net Sales (Purchases) of Short-term Investments (209.6) (465.0) 440.6
Cash Distributions to Subsidiaries (540.2) (300.9) (965.5)
Net Purchases of Property and Equipment (94.0) (91.3) (81.6)
Cash Used by Investing Activities (779.0) (594.5) (827.8)
Cash Flows from Financing Activities      
Short-term Debt Repayment 0.0 0.0 (400.0)
Issuance of Long-term Debt 349.2 588.1 494.1
Long-term Debt Repayment (364.0) (500.0) 0.0
Cost Related to Early Retirement of Debt 3.6 62.8 0.0
Issuance of Common Stock 4.0 3.4 4.4
Repurchase of Common Stock (200.1) (50.0) 0.0
Dividends Paid to Stockholders (254.2) (239.4) (231.9)
Other, Net 0.7 (1.6) (1.4)
Cash Used by Financing Activities (468.0) (262.3) (134.8)
Net Increase (Decrease) in Cash and Bank Deposits $ 3.2 $ 4.2 $ 1.4