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Parent Company Cash Flow Statement (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Cash Flow Statements, Captions      
Cash Provided by Operating Activities $ 1,536.5 $ 1,164.1 $ 1,121.6
Cash Flows from Investing Activities      
Proceeds from Sales of Fixed Maturity Securities 642.5 436.3 911.5
Proceeds from Maturities of Fixed Maturity Securities 2,815.4 2,560.8 2,197.8
Proceeds from Sales and Maturities of Other Investments 454.0 257.9 331.3
Purchase of Fixed Maturity Securities (3,861.7) (2,808.5) (3,362.8)
Purchase of Other Investments (623.2) (474.3) (576.0)
Net Sales (Purchases) of Short-term Investments 200.5 (356.4) 6.3
Net Purchases of Property and Equipment (144.1) (105.3) (85.0)
Acquisition of Business     (140.3)
Net Cash Used by Investing Activities (930.1) (499.3) (715.5)
Cash Flows from Financing Activities      
Short-term Debt Repayment (200.0) 0.0 0.0
Issuance of Long-term Debt 290.7 0.0 609.1
Long-term Debt Repayment (60.0) (63.5) (414.0)
Issuance of Common Stock 4.6 10.8 8.5
Repurchase of Common Stock (356.2) (401.8) (405.2)
Dividends Paid to Stockholders (215.6) (196.0) (182.6)
Other, Net (53.3) (37.3) (34.4)
Net Cash Used by Financing Activities (589.8) (687.8) (418.6)
Net Decrease in Cash and Bank Deposits 16.6 (23.0) (12.5)
Parent Company      
Condensed Cash Flow Statements, Captions      
Cash Provided by Operating Activities 1,052.1 740.6 685.4
Cash Flows from Investing Activities      
Proceeds from Sales of Fixed Maturity Securities 0.0 0.0 2.6
Proceeds from Maturities of Fixed Maturity Securities 52.5 194.3 111.2
Proceeds from Sales and Maturities of Other Investments 0.0 35.2 0.4
Purchase of Fixed Maturity Securities (47.9) (121.2) (56.5)
Purchase of Other Investments (22.3) 0.0 (23.3)
Net Sales (Purchases) of Short-term Investments 192.6 (99.9) (89.8)
Cash Distributions to Subsidiaries (530.8) (79.5) (143.6)
Net Purchases of Property and Equipment (73.2) (83.3) (55.5)
Acquisition of Business (146.1) 0.0 (140.3)
Other, Net 0.0 0.0 0.2
Net Cash Used by Investing Activities (575.2) (154.4) (394.6)
Cash Flows from Financing Activities      
Short-term Debt Repayment (200.0) 0.0 0.0
Issuance of Long-term Debt 290.7 0.0 609.1
Long-term Debt Repayment 0.0 0.0 (350.0)
Issuance of Common Stock 4.6 10.8 8.5
Repurchase of Common Stock (356.2) (401.8) (405.2)
Dividends Paid to Stockholders (215.6) (196.0) (182.6)
Other, Net (9.3) 0.2 (1.0)
Net Cash Used by Financing Activities (485.8) (586.8) (321.2)
Net Decrease in Cash and Bank Deposits $ (8.9) $ (0.6) $ (30.4)