OTHER INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2020

OTHER INVESTMENTS

Schedule of principal components of other investments, which are carried at fair value

	March 31, 2020								December 31, 2019
	Amortized		Unrealized		Unrealized				Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value		Cost		Gains		Losses		Fair Value
	(in millions)
Marketable securities	$	257.9	$	7.3	$	(0.1)	$	265.1	$	257.2	$	3.0	$	(0.4)	$	259.8
Total	$	257.9	$	7.3	$	(0.1)	$	265.1	$	257.2	$	3.0	$	(0.4)	$	259.8

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

	March 31, 2020
	Less than 12 months				12 Months or Greater				Total
			Unrealized				Unrealized				Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
	(in millions)
Marketable securities	$	3.7	$	(0.1)	$	—	$	—	$	3.7	$	(0.1)
Total	$	3.7	$	(0.1)	$	—	$	—	$	3.7	$	(0.1)

	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)
Marketable securities	$	18.8	$	(0.2)	$	13.1	$	(0.2)	$	31.9	$	(0.4)
Total	$	18.8	$	(0.2)	$	13.1	$	(0.2)	$	31.9	$	(0.4)

Schedule of securities by contractual maturity date

	Amortized		Estimated
	Cost		Fair Value
	(in millions)
Due in one year or less	$	40.2	$	40.2
Due after one year through five years		1.4		1.4
Due after five years through ten years		—		—
Due after ten years		216.3		223.5
Total	$	257.9	$	265.1