REDEMPTION SETTLEMENT ASSETS (Tables)

12 Months Ended

Dec. 31, 2019

REDEMPTION SETTLEMENT ASSETS

Schedule of redemption settlement assets

	December 31, 2019								December 31, 2018
		Amortized	Unrealized		Unrealized					Amortized	Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value		Cost		Gains		Losses		Fair Value
	(in millions)
Restricted cash	$	39.3	$	—	$	—	$	39.3	$	43.9	$	—	$	—	$	43.9
Mutual funds		25.1		—		—		25.1		23.2		—		—		23.2
Corporate bonds		536.0		2.4		(2.0)		536.4		497.5		0.1		(6.1)		491.5
Total	$	600.4	$	2.4	$	(2.0)	$	600.8	$	564.6	$	0.1	$	(6.1)	$	558.6

Schedule of unrealized losses and fair value for investments that were in an unrealized loss position, aggregated by investment category and the length of time that individual securities have been in a continuous loss position

	December 31, 2019
	Less than 12 months				12 Months or Greater				Total
			Unrealized				Unrealized				Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	(in millions)
Corporate bonds	$	166.6	$	(1.3)	$	155.1	$	(0.7)	$	321.7	$	(2.0)
Total	$	166.6	$	(1.3)	$	155.1	$	(0.7)	$	321.7	$	(2.0)

	December 31, 2018
	Less than 12 months				12 Months or Greater				Total
			Unrealized				Unrealized				Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	(in millions)
Corporate bonds	$	31.2	$	(0.1)	$	414.4	$	(6.0)	$	445.6	$	(6.1)
Total	$	31.2	$	(0.1)	$	414.4	$	(6.0)	$	445.6	$	(6.1)

Schedule of redemption settlement assets by contractual maturity date

	Amortized		Estimated
	Cost		Fair Value
	(in millions)
Due in one year or less	$	129.5	$	129.4
Due after one year through five years		427.8		428.2
Due after five year through ten years		3.8		3.9
Total	$	561.1	$	561.5