Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
General allowance for credit loss liability on unfunded	$ 5.8	$ 5.9	$ 4.0
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	7.90%	8.40%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.20%	2.40%
Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio		3.50%
Sweden
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.00%	3.10%
Netherlands
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.30%	0.30%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.40%	1.30%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.50%	0.60%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	4.20%	1.50%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.70%	1.40%
Residential-for-Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.20%	5.50%
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	11.40%	4.70%
Senior Housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	7.70%	4.70%
Student Housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	5.00%	4.60%
Vacation Rentals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio		2.30%
Pubs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.50%	2.90%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio		2.70%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.60%	1.90%

Apollo Commercial Real Estate Finance, Inc. 10-K