Customer Trust Funds (Tables)

3 Months Ended

Mar. 31, 2019

Investments Debt And Equity Securities [Abstract]

Schedule of Amortized Cost and Fair Values of Investments of Customer Trust Funds Available for Sale

Investments of Customer Trust Funds at March 31, 2019

	Amortized		Gross Unrealized					Fair
	Cost		Gain		Loss			Value
Money market securities, investments carried at cost and other cash equivalents	$	2,701.2	$	—	$	—		$	2,701.2
Available for sale investments:
U.S. government and agency securities		598.2		1.1		(5.1	)		594.2
Canadian and provincial government securities		396.4		6.8		(0.3	)		402.9
Corporate debt securities		551.4		4.8		(1.1	)		555.1
Asset-backed securities		257.0		0.7		(1.1	)		256.6
Mortgage-backed securities		24.3		0.1		(0.1	)		24.3
Other securities		14.7		—		(0.1	)		14.6
Total available for sale investments		1,842.0		13.5		(7.8	)		1,847.7
Invested customer trust funds		4,543.2	$	13.5	$	(7.8	)		4,548.9
Trust receivables		10.8							10.8
Total customer trust funds	$	4,554.0						$	4,559.7

Investments of Customer Trust Funds at December 31, 2018

	Amortized		Gross Unrealized					Fair
	Cost		Gain		Loss			Value
Money market securities, investments carried at cost and other cash equivalents	$	872.3	$	—	$	—		$	872.3
Available for sale investments:
U.S. government and agency securities		573.4		0.2		(11.4	)		562.2
Canadian and provincial government securities		392.5		3.4		(1.4	)		394.5
Corporate debt securities		499.5		0.5		(4.7	)		495.3
Asset-backed securities		247.1		0.2		(2.7	)		244.6
Mortgage-backed securities		8.5		—		(0.2	)		8.3
Other securities		14.8		—		(0.1	)		14.7
Total available for sale investments		1,735.8		4.3		(20.5	)		1,719.6
Invested customer trust funds		2,608.1	$	4.3	$	(20.5	)		2,591.9
Trust receivables		11.6							11.6
Total customer trust funds	$	2,619.7						$	2,603.5

Schedule of Unrealized Losses and Fair Value

The following represents the gross unrealized losses and the related fair value of the investments of customer trust funds available for sale, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2019.

	Less than 12 months					12 months or more					Total
	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
U.S. government and agency securities	$	(0.1	)	$	24.7	$	(5.0	)	$	384.6	$	(5.1	)	$	409.3
Canadian and provincial government securities		—			—		(0.3	)		98.7		(0.3	)		98.7
Corporate debt securities	(a)				16.4		(1.1	)		169.3		(1.1	)		185.7
Asset-backed securities	(a)				5.0		(1.1	)		156.7		(1.1	)		161.7
Mortgage-backed securities	(a)				4.0		(0.1	)		7.4		(0.1	)		11.4
Other securities		—			—		(0.1	)		10.3		(0.1	)		10.3
Total available for sale investments	$	(0.1	)	$	50.1	$	(7.7	)	$	827.0	$	(7.8	)	$	877.1

(a)	These investments have been in an unrealized loss position; however, the amount of unrealized loss is less than $0.05.

Schedule of Amortized Cost and Fair Value of Investment Securities Available for Sale by Contractual Maturity

The amortized cost and fair value of investment securities available for sale at March 31, 2019, by contractual maturity are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or to prepay obligations with or without call or prepayment penalties.

	March 31, 2019
	Cost		Fair Value
Due in one year or less	$	3,161.8	$	3,160.9
Due in one to three years		545.1		545.3
Due in three to five years		601.1		608.0
Due after five years		235.2		234.7
Invested customer trust funds	$	4,543.2	$	4,548.9