Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Financial Assets Measured on Recurring Basis

The following tables present the level within the fair value hierarchy at which the Company’s financial assets and liabilities are measured on a recurring basis as at March 31, 2017 and December 31, 2016:



	As at March 31, 2017
	Level 1		Level 2			Level 3			Total
	($ in millions)
Available for sale financial assets, at fair value
U.S. government	$	1,267.1	$	—		$	—		$	1,267.1
U.S. agency	—		107.4			—			107.4
Municipal	—		24.4			—			24.4
Corporate	—		2,587.7			—			2,587.7
Non-U.S. government-backed corporate	—		84.5			—			84.5
Non-U.S. government	347.8		146.4			—			494.2
Asset-backed	—		54.8			—			54.8
Non-agency commercial mortgage-backed	—		11.5			—			11.5
Agency mortgage-backed	—		1,032.8			—			1,032.8
Total fixed income securities available for sale, at fair value	1,614.9		4,049.5			—			5,664.4
Short-term investments available for sale, at fair value	131.9		31.6			—			163.5
Held for trading financial assets, at fair value
U.S. government	95.4		—			—			95.4
Municipal	—		15.6			—			15.6
Corporate	—		866.2			—			866.2
Non-U.S. government	—		191.7			—			191.7
Asset-backed	—		13.4			—			13.4
Agency mortgage-backed	—		130.9			—			130.9
Total fixed income securities trading, at fair value	95.4		1,217.8			—			1,313.2
Short-term investments trading, at fair value	75.6		109.0			—			184.6
Equity investments trading, at fair value	623.6		—			—			623.6
Catastrophe bonds trading, at fair value	—		41.8			—			41.8

Other financial assets and liabilities, at fair value
Derivatives at fair value — foreign exchange contracts	—		5.2			—			5.2
Liabilities under derivative contracts — foreign exchange contracts	—		(4.3		)	—			(4.3		)
Loan notes issued by variable interest entities, at fair value	—		—			(110.2		)	(110.2		)
Loan notes issued by variable interest entities, at fair value (included within accrued expenses and other payables)	—		—			(4.9		)	(4.9		)
Total	$	2,541.4	$	5,450.6		$	(115.1	)	$	7,876.9

There were no transfers between Level 1, Level 2 and Level 3 during the three months ended March 31, 2017. The Company settled $111.2 million of Level 3 liabilities in respect of the Loan Notes issued by Silverton for the three months ended March 31, 2017. As at March 31, 2017, there were no assets classified as Level 3 and the Company’s Level 3 liabilities consisted solely of the Loan Notes issued by Silverton.



	As at December 31, 2016
	Level 1		Level 2			Level 3			Total
	($ in millions)
Available for sale financial assets, at fair value
U.S. government	$	1,206.1	$	—		$	—		$	1,206.1
U.S. agency	—		119.6			—			119.6
Municipal	—		24.4			—			24.4
Corporate	—		2,586.5			—			2,586.5
Non-U.S. government-backed corporate	—		89.8			—			89.8
Non-U.S. government	343.7		145.0			—			488.7
Asset-backed	—		63.0			—			63.0
Non-agency commercial mortgage-backed	—		12.6			—			12.6
Agency mortgage-backed	—		1,073.9			—			1,073.9
Total fixed income securities available for sale, at fair value	1,549.8		4,114.8			—			5,664.6
Short-term investments available for sale, at fair value	118.6		26.7			—			145.3
Held for trading financial assets, at fair value
U.S. government	82.4		—			—			82.4
Municipal	—		15.5			—			15.5
Corporate	—		820.6			—			820.6
Non-U.S. government	—		202.8			—			202.8
Asset-backed	—		14.5			—			14.5
Agency mortgage-backed	—		129.9			—			129.9
Total fixed income securities trading, at fair value	82.4		1,183.3			—			1,265.7
Short-term investments trading, at fair value	76.1		109.3			—			185.4
Equity investments trading, at fair value	584.7		—			—			584.7
Catastrophe bonds trading, at fair value	—		42.5			—			42.5

Other financial assets and liabilities, at fair value
Derivatives at fair value – foreign exchange contracts	—		7.2			—			7.2
Liabilities under derivative contracts – foreign exchange contracts	—		(18.4		)	—			(18.4		)
Loan notes issued by variable interest entities, at fair value	—		—			(115.0		)	(115.0		)
Loan notes issued by variable interest entities, at fair value (included within accrued expenses and other payables)	—		—			(108.4		)	(108.4		)
Total	$	2,411.6	$	5,465.4		$	(223.4	)	$	7,653.6

Reconciliation of Liabilities Using Level 3 Inputs

The following table presents a reconciliation of the beginning and ending balances for all assets and liabilities measured at fair value on a recurring basis using Level 3 inputs for the three months ended March 31, 2017 and 2016:



Reconciliation of Liabilities Using Level 3 Inputs	Three Months Ended March 31, 2017			Three Months Ended March 31, 2016
	($ in millions)
Balance at the beginning of the period	$	223.4		$	190.6
Distributed to third party	(111.2		)	(87.4		)
Total change in fair value included in the statement of operations	2.9			4.4
Balance at the end of the period ⁽¹⁾	$	115.1		$	107.6

⁽¹⁾ The amount classified within accrued expenses and other payables was $4.9 million and $3.1 million as at March 31, 2017 and March 31, 2016, respectively.

Pricing Sources Used in Pricing Fixed Income Investments

Pricing sources used in pricing fixed income investments as at March 31, 2017 and December 31, 2016 were as follows:



	As at March 31, 2017		As at December 31, 2016
Index providers	87	%	87	%
Pricing services	7		7
Broker-dealers	6		6
Total	100	%	100	%

Summary of Securities Priced Using Pricing Information from Index Providers

A summary of securities priced using pricing information from index providers as at March 31, 2017 and December 31, 2016 is provided below:



	As at March 31, 2017				As at December 31, 2016
	Fair Market Value Determined using Prices from Index Providers		% of Total Fair Value by Security Type		Fair Market Value Determined using Prices from Index Providers		% of Total Fair Value by Security Type
	($ in millions, except for percentages)
U.S. government	$	1,361.1	100	%	$	1,288.2	100	%
U.S. agency	98.3		92	%	110.2		92	%
Municipal	28.7		72	%	28.8		72	%
Corporate	3,326.0		96	%	3,275.3		96	%
Non-U.S. government-backed corporate	39.6		47	%	44.8		50	%
Non-U.S. government	424.2		68	%	455.6		72	%
Asset-backed	30.4		45	%	32.1		41	%
Non-agency commercial mortgage-backed	11.5		100	%	12.5		98	%
Agency mortgage-backed	661.2		57	%	691.9		58	%
Total fixed income securities	$	5,981.0	87	%	$	5,939.4	87	%
Equities	622.0		100	%	584.7		100	%
Total fixed income securities and equity investments	$	6,603.0	88	%	$	6,524.1	88	%

Fair Value Inputs, Assets, Quantitative Information

The observable and unobservable inputs used to determine the fair value of the Loan Notes as at March 31, 2017 and December 31, 2016 are presented in the tables below:



As at March 31, 2017		Fair Value Level 3			Valuation Method	Observable (O) and Unobservable (U) inputs	Low		High
	($ in millions)						($ in millions)
Loan Notes		$	115.1	⁽¹⁾	Internal Valuation Model	Gross premiums written (O)	$	31.1	$	35.9
						Reserve for losses (U)	$	0.3	$	2.8
						Contract period (O)	N/A		365 days
						Initial value of issuance (O)	$	325.0	$	325.0



As at December 31, 2016		Fair Value Level 3			Valuation Method	Observable (O) and Unobservable (U) inputs	Low		High
	($ in millions)						($ in millions)
Loan Notes		$	223.4	⁽¹⁾	Internal Valuation Model	Gross premiums written (O)	$	38.9	$	43.4
						Reserve for losses (U)	$	2.7	$	11.8
						Contract period (O)	N/A		365 days
						Initial value of issuance (O)	$	220.0	$	220.0

⁽¹⁾ The amount classified within accrued expenses and other payables was $4.9 million and $108.4 million as at March 31, 2017 and December 31, 2016, respectively.