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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 02, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule Of Investments [Line Items]            
Net unrealized gains on impaired securities   $ 9.1   $ 9.1   $ 11.5
Restricted assets, fixed maturities   596.4   596.4    
Restricted assets, cash and cash equivalents   7.1   7.1    
Other-than-temporary impairments on fixed maturities   1.9 $ 2.0 2.9 $ 3.4  
Other-than-temporary impairments on fixed maturities recorded as unrealized losses in AOCI     0.2 0.3 0.2  
Other-than-temporary impairments on fixed maturities recognized in earnings   1.9 1.8 2.6 3.2  
Equity securities, at fair value   554.0   554.0   576.5
Equity securities, cost           $ 433.7
Net unrealized gains (losses) recognized during the period on equity securities still held   $ 7.3   $ (16.2)    
Proceeds from the sale of equities     32.7   46.3  
Retained Earnings [Member]            
Schedule Of Investments [Line Items]            
Net realized gains from sales of equity securities     3.4   5.8  
Accumulated Other Comprehensive Income (Loss), net of tax [Member]            
Schedule Of Investments [Line Items]            
Net unrealized gains (losses) recognized during the period on equity securities still held     $ 7.9   $ 29.4  
Equity Securities [Member] | Retained Earnings [Member]            
Schedule Of Investments [Line Items]            
Cumulative effect on retained earnings, before tax $ 142.8