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REDEMPTION SETTLEMENT ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
REDEMPTION SETTLEMENT ASSETS    
Amortized Cost $ 600.4 $ 564.6
Unrealized Gains 2.4 0.1
Unrealized Losses (2.0) (6.1)
Fair Value 600.8 558.6
Fair Value    
Less than 12 months 166.6 31.2
12 Months or Greater 155.1 414.4
Total 321.7 445.6
Unrealized Losses    
Less than 12 months (1.3) (0.1)
12 Months or Greater (0.7) (6.0)
Total (2.0) (6.1)
Amortized cost of the redemption settlement assets by contractual maturity    
Due in one year or less 129.5  
Due after one year through five years 427.8  
Due after five year through ten years 3.8  
Total 561.1  
Estimated fair value of the redemption settlement assets by contractual maturity    
Due in one year or less 129.4  
Due after one year through five years 428.2  
Due after five year through ten years 3.9  
Total 561.5  
Restricted cash    
REDEMPTION SETTLEMENT ASSETS    
Amortized Cost 39.3 43.9
Fair Value 39.3 43.9
Mutual funds    
REDEMPTION SETTLEMENT ASSETS    
Amortized Cost 25.1 23.2
Fair Value 25.1 23.2
Corporate bonds    
REDEMPTION SETTLEMENT ASSETS    
Amortized Cost 536.0 497.5
Unrealized Gains 2.4 0.1
Unrealized Losses (2.0) (6.1)
Fair Value 536.4 491.5
Fair Value    
Less than 12 months 166.6 31.2
12 Months or Greater 155.1 414.4
Total 321.7 445.6
Unrealized Losses    
Less than 12 months (1.3) (0.1)
12 Months or Greater (0.7) (6.0)
Total $ (2.0) $ (6.1)