Segment Information (Tables)

12 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

Revenue and Income (Loss) Before Income Taxes for Each Segment

Revenue and income before income taxes for each segment were as follows:

	For the Years Ended December 31,
(in millions)	2021		2020		2019
Revenue:
Earned premiums
U.S. Operations	$	1,283.7	$	1,207.6	$	1,119.9
International Operations	625.8		572.5		609.6
Run-off Lines	0.6		0.4		0.2
Total earned premiums	1,910.1		1,780.5		1,729.7
Net investment income
U.S. Operations	119.4		80.3		100.0
International Operations	50.6		26.7		44.2
Run-off Lines	3.6		4.0		5.7
Corporate and Other	14.0		1.7		1.2
Total net investment income	187.6		112.7		151.1
Net realized investment gains (losses)	32.6		(3.6)		80.1
Total revenue	$	2,130.3	$	1,889.6	$	1,960.9

	For the Years Ended December 31,
(in millions)	2021		2020		2019
Income (loss) before income taxes
U.S. Operations	$	61.1	$	113.1	$	139.3
International Operations	64.1		(75.3)		(121.4)
Run-off Lines	(41.5)		(9.6)		(9.8)
Total segment income before taxes	83.7		28.2		8.1
Corporate and Other	(22.5)		(34.5)		(44.8)
Net realized investment and other gains (losses)	32.6		(3.6)		80.1
Foreign currency exchange losses	(1.6)		(15.4)		9.8
Impairment of intangibles	(43.2)		—		(15.6)
Non-operating expense	(43.7)		(21.1)		(37.6)
Total income (loss) before income taxes	$	5.3	$	(46.4)	$	—

Schedule of Earned Premiums by Geographic Location

The table below presents earned premiums by geographic location for the years ended December 31, 2021, 2020 and 2019. For this disclosure, we determine geographic location by the country of domicile of our subsidiaries that underwrite the business and not by the location of insureds or reinsureds from whom the business was generated.

	For the Years Ended December 31,
(in millions)	2021		2020		2019
United States	$	1,277.0	$	1,205.0	$	1,115.8
United Kingdom	475.3		361.1		391.5
Bermuda	54.8		96.5		80.7
Malta	35.4		59.5		85.0
All other jurisdictions	67.6		58.4		56.7
Total earned premiums	$	1,910.1	$	1,780.5	$	1,729.7

Identifiable Assets

The following table represents identifiable assets:

	December 31,
(in millions)	2021		2020
U.S. Operations	$	5,800.1	$	5,915.5
International Operations	3,932.3		3,911.9
Run-off Lines	314.7		337.3
Corporate and Other	270.7		301.1
Total	$	10,317.8	$	10,465.8

Schedule of Goodwill and Intangible Assets Net of Accumulated Amortization

The following table represents goodwill and intangible assets, net of accumulated amortization, as of December 31, 2021 and 2020:

	Goodwill				Intangible Assets, Net of Accumulated Amortization
(in millions)	2021		2020		2021		2020
U.S. Operations	$	118.6	$	118.6	$	—	$	—
International Operations	28.7		28.7		17.3		60.5
Total	$	147.3	$	147.3	$	17.3	$	60.5