XML 104 R72.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
INVESTMENTS - Schedule of Unrealized Losses on Debt Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Fair value, continuous loss position less than 12 months $ 154.8 $ 182.1
Gross unrealized losses, continuous loss position less than 12 months (0.2) (1.2)
Fair value, continuous loss position 12 months or greater 0.0 321.5
Gross unrealized losses, continuous loss position 12 months or greater 0.0 (4.3)
Total fair value, continuous loss position 154.8 503.6
Total gross unrealized losses, continuous loss position (0.2) (5.5)
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, continuous loss position less than 12 months   0.7
Gross unrealized losses, continuous loss position less than 12 months   (0.1)
Fair value, continuous loss position 12 months or greater   56.5
Gross unrealized losses, continuous loss position 12 months or greater   (0.6)
Total fair value, continuous loss position   57.2
Total gross unrealized losses, continuous loss position   (0.7)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, continuous loss position less than 12 months 73.4 4.0
Gross unrealized losses, continuous loss position less than 12 months (0.1) 0.0
Fair value, continuous loss position 12 months or greater 0.0 61.3
Gross unrealized losses, continuous loss position 12 months or greater 0.0 (0.5)
Total fair value, continuous loss position 73.4 65.3
Total gross unrealized losses, continuous loss position (0.1) (0.5)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, continuous loss position less than 12 months 81.4 177.4
Gross unrealized losses, continuous loss position less than 12 months (0.1) (1.1)
Fair value, continuous loss position 12 months or greater 0.0 203.7
Gross unrealized losses, continuous loss position 12 months or greater 0.0 (3.2)
Total fair value, continuous loss position 81.4 381.1
Total gross unrealized losses, continuous loss position $ (0.1) $ (4.3)