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INVESTMENTS - Schedule of Unrealized Losses on Debt Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Fair value, continuous loss position less than 12 months $ 182.1 $ 375.6
Gross unrealized losses, continuous loss position less than 12 months (1.1) (1.7)
Fair value, continuous loss position 12 months or greater 321.5 119.5
Gross unrealized losses, continuous loss position 12 months or greater (4.4) (1.2)
Total fair value, continuous loss position 503.6 495.1
Total gross unrealized losses, continuous loss position (5.5) (2.9)
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, continuous loss position less than 12 months 0.7 31.5
Gross unrealized losses, continuous loss position less than 12 months (0.1) (0.2)
Fair value, continuous loss position 12 months or greater 56.5 37.1
Gross unrealized losses, continuous loss position 12 months or greater (0.6) (0.5)
Total fair value, continuous loss position 57.2 68.6
Total gross unrealized losses, continuous loss position (0.7) (0.7)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, continuous loss position less than 12 months 4.0 90.8
Gross unrealized losses, continuous loss position less than 12 months 0.1 (0.3)
Fair value, continuous loss position 12 months or greater 61.3 23.2
Gross unrealized losses, continuous loss position 12 months or greater (0.6) (0.1)
Total fair value, continuous loss position 65.3 114.0
Total gross unrealized losses, continuous loss position (0.5) (0.4)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, continuous loss position less than 12 months 177.4 253.3
Gross unrealized losses, continuous loss position less than 12 months (1.1) (1.2)
Fair value, continuous loss position 12 months or greater 203.7 59.2
Gross unrealized losses, continuous loss position 12 months or greater (3.2) (0.6)
Total fair value, continuous loss position 381.1 312.5
Total gross unrealized losses, continuous loss position $ (4.3) $ (1.8)