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Schedule 2 - Parent Company Financial Statements - Statements of Cash Flows (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities:                        
Net Income $ 6.5 $ 92.2 $ 37.6 $ 53.8 $ 36.9 $ 47.7 $ 36.6 $ (0.3) $ 190.1 $ 120.9 $ 16.8  
Adjustment Required to Reconcile Net Income to Net Cash Provided by Operations:                        
Equity Securities, FV-NI, Gain (Loss) 76.4 (11.0) (0.4) (0.7)         64.3 0.0 0.0  
Debt and Equity Securities, Realized Gain (Loss) 16.4 3.6 3.8 2.6 11.5 8.1 26.4 10.5 26.4 56.5 33.1  
Net Impairment Losses Recognized in Earnings 2.2 $ 1.8 $ 0.0 0.5 3.8 $ 2.9 $ 2.6 5.0 4.5 14.3 32.7  
Other, Net                 8.6 (2.1) 0.7  
Net Cash Provided by Operating Activities                 539.2 240.6 240.5  
Investing Activities:                        
Sales, Paydowns and Maturities of Fixed Maturities                 2,643.3 528.2 532.3  
Purchases of Fixed Maturities                 (2,413.2) (710.1) (850.3)  
Sales of Equity Securities                 351.9 342.0 158.9  
Sales of Fair Value Option Investments                 0.0 42.2 72.2  
Payments to Acquire Available-for-sale Securities, Equity                 478.5 342.7 90.1  
Purchases of Fair Value Option Investments                 0.0 (7.0) (21.0)  
Payments to Acquire Businesses, Net of Cash Acquired                 (560.6) 0.0 0.0  
Change in Short-term Investments                 52.7 39.4 (18.0)  
Net Cash Used by Investing Activities                 (497.6) (105.4) (238.1)  
Notes Payable Proceeds:                        
Cash Dividends Paid                 (56.4) (49.5) (49.2)  
Common Stock Repurchases                 0.0 0.0 (3.8)  
Cash Exercise of Stock Options                 0.9 4.0 3.5  
Net Cash Used by Financing Activities                 (12.2) (205.2) (48.4)  
Decrease in Cash                 29.4 (70.0) (46.0)  
Cash, Beginning of Year       45.7       115.7 45.7 115.7 161.7  
Cash, End of Year 75.1       45.7       75.1 45.7 115.7 $ 161.7
Parent Company [Member]                        
Operating Activities:                        
Net Income                 190.1 120.9 16.8  
Adjustment Required to Reconcile Net Income to Net Cash Provided by Operations:                        
Equity in Net Income of Subsidiaries                 (238.6) (127.6) (40.4)  
Cash Dividends from Subsidiaries                 130.4 108.1 77.7  
Cash Received for Benefit Plan from Subsidiary                 0.0 0.0 1.4  
Cash Contribution to Defined Benefit Plan                 (5.0) 0.0 (9.0)  
Equity Securities, FV-NI, Gain (Loss)                 (1.4) 0.0 0.0  
Debt and Equity Securities, Realized Gain (Loss)                 (0.7) 0.6 0.1  
Other, Net                 29.6 0.7 (9.3)  
Net Cash Provided by Operating Activities                 105.8 101.5 37.1  
Investing Activities:                        
Capital Contributed to Subsidiary                 (20.0) 0.0 (52.9)  
Sales, Paydowns and Maturities of Fixed Maturities                 (0.2) 45.7 73.5  
Purchases of Fixed Maturities                 0.0 0.0 (77.9)  
Sales of Equity Securities                 67.5 0.0 3.5  
Sales of Fair Value Option Investments                 0.0 42.2 72.2  
Payments to Acquire Available-for-sale Securities, Equity                 2.3 0.0 0.0  
Purchases of Fair Value Option Investments                 0.0 (7.0) (21.0)  
Payments to Acquire Businesses, Net of Cash Acquired                 (564.6) 0.0 0.0  
Change in Short-term Investments                 253.4 15.6 14.8  
Net Cash Used by Investing Activities                 (90.2) 96.5 12.2  
Notes Payable Proceeds:                        
Net Proceeds from Issuance of Subordinated Debentures                 249.4 200.2 0.0  
Repayments of Debt                 (215.0) (360.0) 0.0  
Cash Dividends Paid                 (56.4) (49.5) (49.2)  
Common Stock Repurchases                 0.0 0.0 (3.8)  
Cash Exercise of Stock Options                 0.9 4.0 3.5  
Net Cash Used by Financing Activities                 (21.1) (205.3) (49.5)  
Decrease in Cash                 (5.5) (7.3) (0.2)  
Cash, Beginning of Year       $ 8.4       $ 15.7 8.4 15.7 15.9  
Cash, End of Year $ 2.9       $ 8.4       2.9 8.4 $ 15.7 15.9
Capital Distribution from Subsidiary                 $ 176.0 $ 0.0   $ 0.0