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Investments, Continuous Loss Position (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Estimated Fair Value          
Estimated fair value, less than 12 months $ 1,435,800,000   $ 1,435,800,000   $ 629,700,000
Estimated fair value, 12 months or greater 143,700,000   143,700,000   178,800,000
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months (34,600,000)   (34,600,000)   (4,000,000)
Gross unrealized losses, 12 months or greater $ (7,000,000)   $ (7,000,000)   $ (3,900,000)
Number of issues in loss position, less than 12 months 505   505   230
Number of Issues in loss position, 12 months or greater 64   64   67
Other than temporary impairment, credit losses recognized in earnings $ 0 $ 0 $ 2,000,000 $ 200,000  
Debt Securities [Member]          
Gross Unrealized Losses          
Other than temporary impairment, credit losses recognized in earnings     $ 2,000,000    
Total impairments, number of securities | shares 57 0 57 0  
US Treasury Securities [Member]          
Estimated Fair Value          
Estimated fair value, less than 12 months $ 82,000,000   $ 82,000,000   $ 86,000,000
Estimated fair value, 12 months or greater 17,700,000   17,700,000   23,400,000
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months (1,600,000)   (1,600,000)   (500,000)
Gross unrealized losses, 12 months or greater $ (300,000)   $ (300,000)   $ (300,000)
Number of issues in loss position, less than 12 months 27   27   28
Number of Issues in loss position, 12 months or greater 9   9   10
US Government Agencies Debt Securities [Member]          
Estimated Fair Value          
Estimated fair value, less than 12 months $ 3,700,000   $ 3,700,000   $ 0
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months $ (100,000)   $ (100,000)   $ 0
Number of issues in loss position, less than 12 months 2   2   0
US States and Political Subdivisions Debt Securities [Member]          
Estimated Fair Value          
Estimated fair value, less than 12 months $ 84,000,000   $ 84,000,000   $ 0
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months $ (1,200,000)   $ (1,200,000)   $ 0
Number of issues in loss position, less than 12 months 24   24   0
Corporate Debt Securities [Member]          
Estimated Fair Value          
Estimated fair value, less than 12 months $ 811,500,000   $ 811,500,000   $ 307,600,000
Estimated fair value, 12 months or greater 36,100,000   36,100,000   53,200,000
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months (21,000,000)   (21,000,000)   (2,300,000)
Gross unrealized losses, 12 months or greater $ (1,900,000)   $ (1,900,000)   $ (1,100,000)
Number of issues in loss position, less than 12 months 265   265   113
Number of Issues in loss position, 12 months or greater 15   15   17
Residential Mortgage Backed Securities [Member]          
Estimated Fair Value          
Estimated fair value, less than 12 months $ 310,000,000   $ 310,000,000   $ 165,000,000
Estimated fair value, 12 months or greater 69,700,000   69,700,000   77,100,000
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months (8,100,000)   (8,100,000)   (800,000)
Gross unrealized losses, 12 months or greater $ (3,700,000)   $ (3,700,000)   $ (1,800,000)
Number of issues in loss position, less than 12 months 93   93   45
Number of Issues in loss position, 12 months or greater 32   32   32
Commercial Mortgage Backed Securities [Member]          
Estimated Fair Value          
Estimated fair value, less than 12 months $ 75,400,000   $ 75,400,000   $ 41,800,000
Estimated fair value, 12 months or greater 20,200,000   20,200,000   25,100,000
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months (2,000,000)   (2,000,000)   (200,000)
Gross unrealized losses, 12 months or greater $ (1,100,000)   $ (1,100,000)   $ (700,000)
Number of issues in loss position, less than 12 months 34   34   19
Number of Issues in loss position, 12 months or greater 8   8   8
Asset-backed Securities [Member]          
Estimated Fair Value          
Estimated fair value, less than 12 months $ 53,100,000   $ 53,100,000   $ 29,300,000
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months $ (500,000)   $ (500,000)   $ (200,000)
Number of issues in loss position, less than 12 months 37   37   25
Equity Securities [Member]          
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months         $ (600,000)
Number of issues in loss position, less than 12 months | shares         24
Other than temporary impairment, credit losses recognized in earnings       $ 200,000  
Total impairments, number of securities | shares   1   1  
Other Debt Obligations [Member]          
Estimated Fair Value          
Estimated fair value, less than 12 months $ 16,100,000   $ 16,100,000   $ 0
Gross Unrealized Losses          
Gross unrealized losses, less than 12 months $ (100,000)   $ (100,000)   $ 0
Number of issues in loss position, less than 12 months 23   23   0