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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Debt - Narrative (Details) £ in Millions			1 Months Ended	3 Months Ended
Debt - Narrative (Details) £ in Millions	Apr. 07, 2020 USD ($)	Apr. 07, 2020 GBP (£)	Mar. 31, 2007 USD ($)	Mar. 31, 2021 USD ($) credit_facility	Mar. 31, 2021 GBP (£)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 EUR (€) credit_facility	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 15, 2018 USD ($)	Mar. 31, 2007 EUR (€)
Debt Instrument
Total commitment under revolving credit facility	$ 291,400,000					$ 234,000,000.0
Debt covenant, maximum loan to value percent, period one				50.00%			50.00%
Debt covenant, maximum loan to value percent, period two				40.00%			40.00%
Debt covenant, maximum loan to value percent, period three				25.00%			25.00%
Debt covenant, maximum loan to value percent, period four				15.00%			15.00%
Debt covenant, maximum loan to value percent, period five				0.00%			0.00%
Debt covenant, maximum loan to value percent				29.50%			29.50%
Debt				$ 429,700,000				$ 376,400,000
Draw down of debt and revolving line of credit				$ 105,300,000		$ 12,000,000.0
Other
Debt Instrument
Secured credit facilities \| credit_facility				2			2
Specialty Insurance Distribution (NSM)
Debt Instrument
Debt				$ 272,700,000				272,600,000
Weighted Average Interest rate				8.50%		7.60%	8.50%
Specialty Insurance Distribution (NSM) \| Term loan - hedged
Debt Instrument
Weighted Average Interest rate				9.20%		8.10%	9.20%
Specialty Insurance Distribution (NSM) \| Term loan - unhedged
Debt Instrument
Weighted Average Interest rate				7.70%		6.60%	7.70%
NSM Bank Facility \| Specialty Insurance Distribution (NSM)
Debt Instrument
Amount borrowed				$ 277,300,000
Percentage of discounted future cash flows				10.00%	10.00%
Debt				$ 277,300,000		$ 220,700,000		277,400,000	$ 221,300,000
NSM Bank Facility \| Term Loan
Debt Instrument
Debt				271,500,000				271,300,000
Amount borrowed				277,300,000				277,400,000
NSM Bank Facility \| Term Loan \| Specialty Insurance Distribution (NSM)
Debt Instrument
Amount borrowed	276,400,000					224,000,000.0
Borrowings	$ 52,400,000	£ 42.5		0		0
NSM Bank Facility \| Term Loan \| Specialty Insurance Distribution (NSM) \| Interest Rate Swap
Debt Instrument
Total commitment under revolving credit facility										$ 151,000,000.0
Hedged liability, fair value										$ 151,000,000.0
NSM Bank Facility \| Term Loan \| Specialty Insurance Distribution (NSM) \| Interest Rate Swap \| Term loan - hedged
Debt Instrument
Debt				147,200,000
NSM Bank Facility \| Term Loan \| Specialty Insurance Distribution (NSM) \| Interest Rate Swap \| Term loan - unhedged
Debt Instrument
Debt				$ 130,100,000
NSM Bank Facility \| Term Loan \| Specialty Insurance Distribution (NSM) \| USD-LIBOR \| Minimum
Debt Instrument
Basis spread on variable rate	4.25%	4.25%		5.50%	5.50%
NSM Bank Facility \| Term Loan \| Specialty Insurance Distribution (NSM) \| USD-LIBOR \| Maximum
Debt Instrument
Basis spread on variable rate	4.75%	4.75%		6.00%	6.00%
Debt instrument, interest rate, increase (decrease)				1.25%	1.25%
NSM Bank Facility \| Term Loan \| Specialty Insurance Distribution (NSM) \| GBP-LIBOR \| Minimum
Debt Instrument
Basis spread on variable rate				6.00%	6.00%
NSM Bank Facility \| Term Loan \| Specialty Insurance Distribution (NSM) \| GBP-LIBOR \| Maximum
Debt Instrument
Basis spread on variable rate				6.50%	6.50%
Derivative, cap interest rate				1.25%			1.25%
NSM Bank Facility \| Revolving credit loan \| Specialty Insurance Distribution (NSM)
Debt Instrument
Total commitment under revolving credit facility	$ 15,000,000.0					10,000,000.0
Borrowings				$ 0		$ 0
NSM Bank Facility \| GBP Term Loan \| Specialty Insurance Distribution (NSM)
Debt Instrument
Borrowings				58,200,000	£ 42.5
Other NSM
Debt Instrument
Debt								1,300,000
Other NSM \| Term Loan \| Specialty Insurance Distribution (NSM)
Debt Instrument
Debt				1,400,000
Kudu Bank Facility \| Kudu
Debt Instrument
Total commitment under revolving credit facility				300,000,000.0
Debt				60,800,000
Kudu Bank Facility \| Term Loan
Debt Instrument
Debt								86,300,000
Amount borrowed								$ 89,200,000
Kudu Bank Facility \| Term Loan \| Kudu
Debt Instrument
Amount borrowed				198,000,000.0
Percentage of borrowing base				0.35
Kudu Bank Facility \| Line of Credit \| Kudu
Debt Instrument
Interest Reserve				$ 3,900,000
Kudu Bank Facility \| Line of Credit \| Kudu \| London Interbank Offered Rate (LIBOR)
Debt Instrument
Basis spread on variable rate				4.30%	4.30%
Kudu Bank Facility \| Line of Credit \| Kudu \| Base Rate
Debt Instrument
Basis spread on variable rate				0.25%	0.25%
Kudu Bank Facility \| Revolving credit loan \| Kudu
Debt Instrument
Total commitment under revolving credit facility				$ 102,000,000.0
Repayments on credit facility				92,200,000
First Credit Facility \| Other
Debt Instrument
Total commitment under revolving credit facility				16,300,000
First Credit Facility \| Term Loan \| Other
Debt Instrument
Total commitment under revolving credit facility				11,300,000
Repayments of lines of credit				600,000
Amount borrowed				8,800,000
First Credit Facility \| Delayed Draw Term Loans \| Other
Debt Instrument
Total commitment under revolving credit facility				3,000,000.0
First Credit Facility \| Revolving credit loan \| Other
Debt Instrument
Total commitment under revolving credit facility				2,000,000.0
Draw down of debt and revolving line of credit				300,000
Second Credit Facility \| Other
Debt Instrument
Total commitment under revolving credit facility				15,000,000.0
Second Credit Facility \| Term Loan \| Other
Debt Instrument
Total commitment under revolving credit facility				9,000,000.0
Repayments of lines of credit				200,000
Amount borrowed				8,700,000
Second Credit Facility \| Delayed Draw Term Loans \| Other
Debt Instrument
Total commitment under revolving credit facility				4,000,000.0
Second Credit Facility \| Revolving credit loan \| Other
Debt Instrument
Total commitment under revolving credit facility				2,000,000.0
Ark \| Term Loan
Debt Instrument
Total commitment under revolving credit facility				150,000,000.0
Line of credit				45,000,000.0
Ark Alesco Note \| Junior Notes \| Ark
Debt Instrument
Amount borrowed			$ 30,000,000.0
Debt				30,000,000.0
Ark Alesco Note \| Junior Notes \| London Interbank Offered Rate (LIBOR) \| Ark
Debt Instrument
Basis spread on variable rate			4.60%
Ark Dekania Note \| Junior Notes \| Ark
Debt Instrument
Amount borrowed \| €											€ 12,000,000.0
Debt				$ 14,100,000			€ 12,000,000.0
Ark Dekania Note \| Junior Notes \| EURIBOR \| Ark
Debt Instrument
Basis spread on variable rate			4.60%