Stockholders' Equity - Repurchase activity (Details)	3 Months Ended						6 Months Ended		12 Months Ended		42 Months Ended
Stockholders' Equity - Repurchase activity (Details)	Jun. 30, 2026 USD ($) shares	Mar. 31, 2026 USD ($) $ / shares shares	Dec. 31, 2025 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2025 USD ($) $ / shares shares	Mar. 31, 2025 USD ($) $ / shares shares	Jun. 30, 2026 USD ($) shares	Jun. 30, 2025 USD ($) shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Jun. 30, 2026 shares
Class of Stock
Repurchase of common stock \| $	$ 200,813	$ 205,820			$ 204,840	$ 204,863
Class K Common Stock
Class of Stock
Number of Share Repurchases Requested	23,132	67,654	78,008	40,889	32,542	20,042			282,359	122,684
Shares Repurchased		14,716	9,057	6,656	12,746	4,842			48,967	32,297
Amount of Shares Repurchased \| $		$ 149,665	$ 92,114	$ 67,696	$ 129,628	$ 49,241		$ 129,628	$ 511,412	$ 369,950
Repurchase of common stock \| $							$ 195,642	$ 198,049
Average Amount per share \| $ / shares		$ 10.17	$ 10.17	$ 10.17	$ 10.17	$ 10.17			$ 10.44	$ 11.45
Requests Withdrawn					9,757			9,757
Repurchase Requests Outstanding	23,132	52,938									410,144
Number of outstanding and unfulfilled repurchase request	124						124				124
Class K Common Stock \| One hundred and twenty four unfilled standard repurchase requests
Class of Stock
Repurchase Requests Outstanding							410,144	309,814
Class K One Common Stock
Class of Stock
Shares Repurchased			921	1,225	463	370			20,144	23,798
Amount of Shares Repurchased \| $			$ 9,363	$ 12,452	$ 4,712	$ 3,762		$ 4,712	$ 204,863	$ 273,831
Average Amount per share \| $ / shares			$ 10.17	$ 10.17	$ 10.17	$ 10.17			$ 10.17	$ 11.51
Requests Withdrawn									2,457
Repurchase Requests Outstanding			68,030
Class K Two Common Stock
Class of Stock
Shares Repurchased				441	342	685			13,033	1,603
Amount of Shares Repurchased \| $				$ 4,482	$ 3,483	$ 6,961		3,483	$ 132,512	$ 7,019
Average Amount per share \| $ / shares				$ 10.17	$ 10.17	$ 10.17			$ 10.17	$ 10.17
Repurchase Requests Outstanding				32,567
Class K Three Common Stock
Class of Stock
Shares Repurchased					123	506			4,589	1,565
Amount of Shares Repurchased \| $					$ 1,253	$ 5,145		1,253	$ 46,672	$ 15,917
Average Amount per share \| $ / shares					$ 10.17	$ 10.17			$ 10.17	$ 10.17
Requests Withdrawn									14,079	671
Repurchase Requests Outstanding					9,111
Class K Four Common Stock
Class of Stock
Shares Repurchased						182			8,266	2,895
Amount of Shares Repurchased \| $						$ 1,852			$ 84,064	$ 29,455
Average Amount per share \| $ / shares						$ 10.17			$ 10.17	$ 10.17
Requests Withdrawn									1,366
Repurchase Requests Outstanding						13,457
Class K Five Common Stock
Class of Stock
Shares Repurchased									6,061	1,892
Amount of Shares Repurchased \| $									$ 61,634	$ 19,246
Average Amount per share \| $ / shares									$ 10.17	$ 10.17
Requests Withdrawn									658	6,937
Class K Six Common Stock
Class of Stock
Shares Repurchased									2,174	682
Amount of Shares Repurchased \| $									$ 22,098	$ 6,929
Average Amount per share \| $ / shares									$ 10.16	$ 10.17
Repurchase Requests Outstanding									160,565	50,344
Class K-I Common Stock
Class of Stock
Number of Share Repurchases Requested	14,224	6,939	588	8,208		5,000			19,853	7,186
Shares Repurchased		93	21	379		123			158	2,142
Amount of Shares Repurchased \| $		$ 942	$ 213	$ 3,853		$ 1,224			$ 1,823	$ 24,628
Repurchase of common stock \| $							$ 5,171	$ 6,791
Average Amount per share \| $ / shares		$ 10.17	$ 10.17	$ 10.17		$ 9.92			$ 11.53	$ 11.5
Requests Withdrawn										1,036
Repurchase Requests Outstanding	14,224	6,846									51,794
Number of outstanding and unfulfilled repurchase request	81						81				81
Class K-I Common Stock \| Eighty-one unfulfilled repurchase requests
Class of Stock
Repurchase Requests Outstanding							51,794	27,078
Class K-I One Common Stock
Class of Stock
Shares Repurchased			8	280		119			474	954
Amount of Shares Repurchased \| $			$ 76	$ 2,847		$ 1,207			$ 4,820	$ 10,771
Average Amount per share \| $ / shares			$ 10.17	$ 10.17		$ 10.17			$ 10.17	$ 11.29
Repurchase Requests Outstanding			559
Class K-I Two Common Stock
Class of Stock
Shares Repurchased				101		220			433	74
Amount of Shares Repurchased \| $				$ 1,025		$ 2,234			$ 4,406	$ 747
Average Amount per share \| $ / shares				$ 10.17		$ 10.17			$ 10.17	$ 10.07
Requests Withdrawn									1,420
Repurchase Requests Outstanding				7,448
Class K-I Three Common Stock
Class of Stock
Shares Repurchased						162			801	73
Amount of Shares Repurchased \| $						$ 1,651			$ 8,152	$ 737
Average Amount per share \| $ / shares						$ 10.17			$ 10.17	$ 10.17
Class K-I Four Common Stock
Class of Stock
Shares Repurchased						58			593	134
Amount of Shares Repurchased \| $						$ 594			$ 6,026	$ 1,365
Average Amount per share \| $ / shares						$ 10.17			$ 10.17	$ 10.17
Repurchase Requests Outstanding						4,318
Class K-I Five Common Stock
Class of Stock
Shares Repurchased									213	99
Amount of Shares Repurchased \| $									$ 2,170	$ 1,009
Average Amount per share \| $ / shares									$ 10.17	$ 10.17
Repurchase Requests Outstanding									15,761
Class K-I Six Common Stock
Class of Stock
Shares Repurchased										36
Amount of Shares Repurchased \| $										$ 364
Average Amount per share \| $ / shares										$ 10.17
Repurchase Requests Outstanding										2,638