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Customer Trust Funds (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2018

Dec. 31, 2017

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 September 30, 2018

		Amortized Cost				Gross Unrealized								Fair Value
						Gain				Loss
Money market securities, investments carried at cost and other cash equivalents		$	1,697.9			$	—			$	—			$	1,697.9
Available for sale investments:
U.S. government and agency securities			548.6				—				(19.1	)			529.5
Canadian and provincial government securities			414.6				2.1				(2.7	)			414.0
Corporate debt securities			513.1				0.2				(6.8	)			506.5
Asset-backed securities			249.6				—				(3.6	)			246.0
Mortgage-backed securities			9.7				—				(0.3	)			9.4
Other securities			14.9				—				(0.2	)			14.7
Total available for sale investments			1,750.5				2.3				(32.7	)			1,720.1
Invested customer trust funds			3,448.4			$	2.3			$	(32.7	)			3,418.0
Trust receivables			8.6												8.6
Total customer trust funds		$	3,457.0											$	3,426.6

Investments of Customer Trust Funds at December 31, 2017

		Amortized Cost				Gross Unrealized								Fair Value
						Gain				Loss
Money market securities, investments carried at cost and other cash equivalents		$	2,309.3			$	—			$	—			$	2,309.3
Available for sale investments:
U.S. government and agency securities			584.6				0.1				(7.1	)			577.6
Canadian and provincial government securities			418.2				6.6				(1.5	)			423.3
Corporate debt securities			472.3				0.8				(2.5	)			470.6
Asset-backed securities			280.8				—				(1.8	)			279.0
Mortgage-backed securities			15.0				—				(0.2	)			14.8
Other securities			17.0				—				(0.2	)			16.8
Total available for sale investments			1,787.9				7.5				(13.3	)			1,782.1
Invested customer trust funds			4,097.2			$	7.5			$	(13.3	)			4,091.4
Trust receivables			8.3												8.3
Total customer trust funds		$	4,105.5											$	4,099.7

Investments of Customer Trust Funds at December 31, 2017

		Amortized Cost				Gross Unrealized								Fair Value
						Gain				Loss
Money market securities, investments carried at cost and other cash equivalents		$	2,309.3			$	—			$	—			$	2,309.3
Available for sale investments:
U.S. government and agency securities			584.6				0.1				(7.1	)			577.6
Canadian and provincial government securities			418.2				6.6				(1.5	)			423.3
Corporate debt securities		$	472.3			$	0.8			$	(2.5	)		$	470.6
Asset-backed securities			280.8				—				(1.8	)			279.0
Mortgage-backed securities			15.0				—				(0.2	)			14.8
Other securities			17.0				—				(0.2	)			16.8
Total available for sale investments			1,787.9				7.5				(13.3	)			1,782.1
Invested customer trust funds			4,097.2			$	7.5			$	(13.3	)			4,091.4
Trust receivables			8.3												8.3
Total customer trust funds		$	4,105.5											$	4,099.7

Investments of Customer Trust Funds at December 31, 2016

		Amortized Cost				Gross Unrealized								Fair Value
						Gain				Loss
Money market securities, investments carried at cost and other cash equivalents		$	1,941.9			$	—			$	—			$	1,941.9
Available for sale investments:
U.S. government and agency securities			607.7				0.9				(4.7	)			603.9
Canadian and provincial government securities			380.0				12.9				(0.1	)			392.8
Corporate debt securities			511.7				3.1				(1.2	)			513.6
Asset-backed securities			192.2				0.4				(0.3	)			192.3
Mortgage-backed securities			28.7				—				(0.2	)			28.5
Other securities			24.6				—				(0.3	)			24.3
Total available for sale investments			1,744.9				17.3				(6.8	)			1,755.4
Invested customer trust funds			3,686.8			$	17.3			$	(6.8	)			3,697.3
Trust receivables			5.5												5.5
Total customer trust funds		$	3,692.3											$	3,702.8

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 September 30, 2018.

		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		$	(8.0	)		$	257.9			$	(11.1	)		$	268.7			$	(19.1	)		$	526.6
Canadian and provincial government securities			(0.9	)			86.9				(1.8	)			100.8				(2.7	)			187.7
Corporate debt securities			(3.7	)			271.1				(3.1	)			145.9				(6.8	)			417.0
Asset-backed securities			(1.1	)			97.4				(2.5	)			129.8				(3.6	)			227.2
Mortgage-backed securities			(a	)			1.2				(0.3	)			8.0				(0.3	)			9.2
Other securities			(0.1	)			4.0				(0.1	)			10.5				(0.2	)			14.5
Total available for sale investments		$	(13.8	)		$	718.5			$	(18.9	)		$	663.7			$	(32.7	)		$	1,382.2

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

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 December 31, 2017.

		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		$	(3.6	)		$	436.7			$	(3.5	)		$	113.5			$	(7.1	)		$	550.2
Canadian and provincial government securities			(1.5	)			133.4				—				—				(1.5	)			133.4
Corporate debt securities			(2.0	)			264.2				(0.5	)			41.4				(2.5	)			305.6
Asset-backed securities			(1.7	)			239.6				(0.1	)			17.0				(1.8	)			256.6
Mortgage-backed securities			(0.1	)			4.1				(0.2	)			10.4				(0.3	)			14.5
Other securities				(a)			2.4				(0.1	)			12.6				(0.1	)			15.0
Total available for sale investments		$	(8.9	)		$	1,080.4			$	(4.4	)		$	194.9			$	(13.3	)		$	1,275.3

(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

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.

		September 30, 2018
		Cost				Fair Value
Due in one year or less		$	2,024.4			$	2,023.9
Due in one to three years			565.6				556.5
Due in three to five years			565.5				557.6
Due after five years			292.9				280.0
Invested customer trust funds		$	3,448.4			$	3,418.0

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.

		December 31, 2017
		Cost				Fair Value
Due in one year or less		$	2,761.6			$	2,762.0
Due in one to three years			518.3				648.8
Due in three to five years			528.8				473.9
Due after five years			288.5				206.7
Invested customer trust funds		$	4,097.2			$	4,091.4

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