XML 57 R40.htm IDEA: XBRL DOCUMENT
v3.20.4

Segment Information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Segment Reporting [Abstract] |
Analysis of underwriting income (loss) by segment and reconciliation to net income (loss) available to common shareholders | The following tables summarize the Company’s underwriting income or loss by segment, together with a reconciliation of underwriting income or loss to net income available to Arch common shareholders, summary information regarding net premiums written and earned by major line of business and net premiums written by location:
| Year Ended December 31, 2020
| Insurance |  | Reinsurance |  | Mortgage |  | Sub-Total |  | Other |  | Total
Gross premiums written (1) | $ | 4,688,562 |  |  | $ | 3,472,086 |  |  | $ | 1,473,999 |  |  | $ | 9,632,691 |  |  | $ | 728,546 |  |  | $ | 10,088,068 |
Premiums ceded | (1,525,655) |  |  | (1,014,716) |  |  | (194,149) |  |  | (2,732,564) |  |  | (190,957) |  |  | (2,650,352) |
Net premiums written | 3,162,907 |  |  | 2,457,370 |  |  | 1,279,850 |  |  | 6,900,127 |  |  | 537,589 |  |  | 7,437,716 |
Change in unearned premiums | (291,487) |  |  | (295,141) |  |  | 118,085 |  |  | (468,543) |  |  | 22,762 |  |  | (445,781) |
Net premiums earned | 2,871,420 |  |  | 2,162,229 |  |  | 1,397,935 |  |  | 6,431,584 |  |  | 560,351 |  |  | 6,991,935 |
Other underwriting income (loss) | (31) |  |  | 4,454 |  |  | 20,316 |  |  | 24,739 |  |  | 2,045 |  |  | 26,784 |
Losses and loss adjustment expenses | (2,092,453) |  |  | (1,628,320) |  |  | (528,344) |  |  | (4,249,117) |  |  | (440,482) |  |  | (4,689,599) |
Acquisition expenses | (418,483) |  |  | (354,048) |  |  | (134,240) |  |  | (906,771) |  |  | (98,071) |  |  | (1,004,842) |
Other operating expenses | (489,153) |  |  | (168,011) |  |  | (162,202) |  |  | (819,366) |  |  | (55,810) |  |  | (875,176) |
Underwriting income (loss) | $ | (128,700) |  |  | $ | 16,304 |  |  | $ | 593,465 |  |  | 481,069 |  |  | (31,967) |  |  | 449,102 |
Net investment income |  |  |  |  |  |  | 401,908 |  |  | 117,700 |  |  | 519,608 |
Net realized gains (losses) |  |  |  |  |  |  | 813,781 |  |  | 9,679 |  |  | 823,460 |
Equity in net income (loss) of investments accounted for using the equity method |  |  |  |  |  |  | 146,693 |  |  | — |  |  | 146,693 |
Other income (loss) |  |  |  |  |  |  | 16,795 |  |  | — |  |  | 16,795 |
Corporate expenses |  |  |  |  |  |  | (68,492) |  |  | — |  |  | (68,492) |
Transaction costs and other |  |  |  |  |  |  | (9,456) |  |  | (4,040) |  |  | (13,496) |
Amortization of intangible assets |  |  |  |  |  |  | (69,031) |  |  | — |  |  | (69,031) |
Interest expense |  |  |  |  |  |  | (120,214) |  |  | (23,242) |  |  | (143,456) |
Net foreign exchange gains (losses) |  |  |  |  |  |  | (80,161) |  |  | (3,473) |  |  | (83,634) |
Income (loss) before income taxes |  |  |  |  |  |  | 1,512,892 |  |  | 64,657 |  |  | 1,577,549 |
Income tax expense |  |  |  |  |  |  | (111,812) |  |  | (26) |  |  | (111,838) |
Net income (loss) |  |  |  |  |  |  | 1,401,080 |  |  | 64,631 |  |  | 1,465,711 |
Amounts attributable to redeemable noncontrolling interests |  |  |  |  |  |  | (2,997) |  |  | (4,117) |  |  | (7,114) |
Amounts attributable to nonredeemable noncontrolling interests |  |  |  |  |  |  | — |  |  | (53,076) |  |  | (53,076) |
Net income (loss) available to Arch |  |  |  |  |  |  | 1,398,083 |  |  | 7,438 |  |  | 1,405,521 |
Preferred dividends |  |  |  |  |  |  | (41,612) |  |  | — |  |  | (41,612) |
Net income (loss) available to Arch common shareholders |  |  |  |  |  |  | $ | 1,356,471 |  |  | $ | 7,438 |  |  | $ | 1,363,909 |
Underwriting Ratios |  |  |  |  |  |  |  |  |  |  |
Loss ratio | 72.9 | % |  | 75.3 | % |  | 37.8 | % |  | 66.1 | % |  | 78.6 | % |  | 67.1 | %
Acquisition expense ratio | 14.6 | % |  | 16.4 | % |  | 9.6 | % |  | 14.1 | % |  | 17.5 | % |  | 14.4 | %
Other operating expense ratio | 17.0 | % |  | 7.8 | % |  | 11.6 | % |  | 12.7 | % |  | 10.0 | % |  | 12.5 | %
Combined ratio | 104.5 | % |  | 99.5 | % |  | 59.0 | % |  | 92.9 | % |  | 106.1 | % |  | 94.0 | %
Goodwill and intangible assets | $ | 280,978 |  |  | $ | 18,963 |  |  | $ | 385,272 |  |  | $ | 685,213 |  |  | $ | 7,650 |  |  | $ | 692,863 |
Total investable assets |  |  |  |  |  |  | $ | 26,856,295 |  |  | $ | 2,657,612 |  |  | $ | 29,513,907 |
Total assets |  |  |  |  |  |  | 39,791,983 |  |  | 3,490,314 |  |  | 43,282,297 |
Total liabilities |  |  |  |  |  |  | 26,789,149 |  |  | 2,505,707 |  |  | 29,294,856 |
(1) Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.
| Year Ended December 31, 2019
| Insurance |  | Reinsurance |  | Mortgage |  | Sub-Total |  | Other |  | Total
Gross premiums written (1) | $ | 3,907,993 |  |  | $ | 2,323,223 |  |  | $ | 1,466,265 |  |  | $ | 7,695,645 |  |  | $ | 754,881 |  |  | $ | 8,138,960 |
Premiums ceded | (1,266,267) |  |  | (720,500) |  |  | (204,509) |  |  | (2,189,440) |  |  | (222,019) |  |  | (2,099,893) |
Net premiums written | 2,641,726 |  |  | 1,602,723 |  |  | 1,261,756 |  |  | 5,506,205 |  |  | 532,862 |  |  | 6,039,067 |
Change in unearned premiums | (244,646) |  |  | (136,334) |  |  | 104,584 |  |  | (276,396) |  |  | 23,827 |  |  | (252,569) |
Net premiums earned | 2,397,080 |  |  | 1,466,389 |  |  | 1,366,340 |  |  | 5,229,809 |  |  | 556,689 |  |  | 5,786,498 |
Other underwriting income | — |  |  | 6,444 |  |  | 16,005 |  |  | 22,449 |  |  | 2,412 |  |  | 24,861 |
Losses and loss adjustment expenses | (1,615,475) |  |  | (1,011,329) |  |  | (53,513) |  |  | (2,680,317) |  |  | (453,135) |  |  | (3,133,452) |
Acquisition expenses, net | (361,614) |  |  | (239,032) |  |  | (134,319) |  |  | (734,965) |  |  | (105,980) |  |  | (840,945) |
Other operating expenses | (454,770) |  |  | (141,484) |  |  | (153,092) |  |  | (749,346) |  |  | (51,651) |  |  | (800,997) |
Underwriting income (loss) | $ | (34,779) |  |  | $ | 80,988 |  |  | $ | 1,041,421 |  |  | 1,087,630 |  |  | (51,665) |  |  | 1,035,965 |
Net investment income |  |  |  |  |  |  | 491,067 |  |  | 136,671 |  |  | 627,738 |
Net realized gains (losses) |  |  |  |  |  |  | 348,037 |  |  | 15,161 |  |  | 363,198 |
Equity in net income (loss) of investments accounted for using the equity method |  |  |  |  |  |  | 123,672 |  |  | — |  |  | 123,672 |
Other income (loss) |  |  |  |  |  |  | 2,233 |  |  | — |  |  | 2,233 |
Corporate expenses |  |  |  |  |  |  | (65,667) |  |  | — |  |  | (65,667) |
Transaction costs and other |  |  |  |  |  |  | (14,444) |  |  | — |  |  | (14,444) |
Amortization of intangible assets |  |  |  |  |  |  | (82,104) |  |  | — |  |  | (82,104) |
Interest expense |  |  |  |  |  |  | (93,735) |  |  | (27,137) |  |  | (120,872) |
Net foreign exchange gains (losses) |  |  |  |  |  |  | (9,252) |  |  | (11,357) |  |  | (20,609) |
Income (loss) before income taxes |  |  |  |  |  |  | 1,787,437 |  |  | 61,673 |  |  | 1,849,110 |
Income tax (expense) benefit |  |  |  |  |  |  | (155,790) |  |  | (20) |  |  | (155,810) |
Net income (loss) |  |  |  |  |  |  | 1,631,647 |  |  | 61,653 |  |  | 1,693,300 |
Amounts attributable to redeemable noncontrolling interests |  |  |  |  |  |  | — |  |  | (16,909) |  |  | (16,909) |
Amounts attributable to nonredeemable noncontrolling interests |  |  |  |  |  |  | — |  |  | (40,072) |  |  | (40,072) |
Net income (loss) available to Arch |  |  |  |  |  |  | 1,631,647 |  |  | 4,672 |  |  | 1,636,319 |
Preferred dividends |  |  |  |  |  |  | (41,612) |  |  | — |  |  | (41,612) |
Net income (loss) available to Arch common shareholders |  |  |  |  |  |  | $ | 1,590,035 |  |  | $ | 4,672 |  |  | $ | 1,594,707 |
Underwriting Ratios |  |  |  |  |  |  |  |  |  |  |
Loss ratio | 67.4 | % |  | 69.0 | % |  | 3.9 | % |  | 51.3 | % |  | 81.4 | % |  | 54.2 | %
Acquisition expense ratio | 15.1 | % |  | 16.3 | % |  | 9.8 | % |  | 14.1 | % |  | 19.0 | % |  | 14.5 | %
Other operating expense ratio | 19.0 | % |  | 9.6 | % |  | 11.2 | % |  | 14.3 | % |  | 9.3 | % |  | 13.8 | %
Combined ratio | 101.5 | % |  | 94.9 | % |  | 24.9 | % |  | 79.7 | % |  | 109.7 | % |  | 82.5 | %
Goodwill and intangible assets | $ | 289,021 |  |  | $ | 2,516 |  |  | $ | 438,896 |  |  | $ | 730,433 |  |  | $ | 7,650 |  |  | $ | 738,083 |
Total investable assets |  |  |  |  |  |  | $ | 22,285,676 |  |  | $ | 2,704,589 |  |  | $ | 24,990,265 |
Total assets |  |  |  |  |  |  | 34,374,468 |  |  | 3,510,893 |  |  | 37,885,361 |
Total liabilities |  |  |  |  |  |  | 22,977,636 |  |  | 2,592,173 |  |  | 25,569,809 |
(1) Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.
| Year Ended December 31, 2018
| Insurance |  | Reinsurance |  | Mortgage |  | Sub-Total |  | Other |  | Total
Gross premiums written (1) | $ | 3,262,332 |  |  | $ | 1,912,522 |  |  | $ | 1,360,708 |  |  | $ | 6,534,423 |  |  | $ | 735,015 |  |  | $ | 6,961,004 |
Premiums ceded | (1,050,207) |  |  | (539,950) |  |  | (202,833) |  |  | (1,791,851) |  |  | (130,840) |  |  | (1,614,257) |
Net premiums written | 2,212,125 |  |  | 1,372,572 |  |  | 1,157,875 |  |  | 4,742,572 |  |  | 604,175 |  |  | 5,346,747 |
Change in unearned premiums | (6,464) |  |  | (111,356) |  |  | 28,361 |  |  | (89,459) |  |  | (25,313) |  |  | (114,772) |
Net premiums earned | 2,205,661 |  |  | 1,261,216 |  |  | 1,186,236 |  |  | 4,653,113 |  |  | 578,862 |  |  | 5,231,975 |
Other underwriting income | — |  |  | (682) |  |  | 13,033 |  |  | 12,351 |  |  | 2,722 |  |  | 15,073 |
Losses and loss adjustment expenses | (1,520,680) |  |  | (846,882) |  |  | (81,289) |  |  | (2,448,851) |  |  | (441,255) |  |  | (2,890,106) |
Acquisition expenses, net | (349,702) |  |  | (211,280) |  |  | (118,595) |  |  | (679,577) |  |  | (125,558) |  |  | (805,135) |
Other operating expenses | (364,138) |  |  | (133,350) |  |  | (142,432) |  |  | (639,920) |  |  | (37,889) |  |  | (677,809) |
Underwriting income (loss) | $ | (28,859) |  |  | $ | 69,022 |  |  | $ | 856,953 |  |  | 897,116 |  |  | (23,118) |  |  | 873,998 |
Net investment income |  |  |  |  |  |  | 437,958 |  |  | 125,675 |  |  | 563,633 |
Net realized gains (losses) |  |  |  |  |  |  | (287,258) |  |  | (120,915) |  |  | (408,173) |
Equity in net income (loss) of investments accounted for using the equity method |  |  |  |  |  |  | 45,641 |  |  | — |  |  | 45,641 |
Other income (loss) |  |  |  |  |  |  | 2,419 |  |  | — |  |  | 2,419 |
Corporate expenses |  |  |  |  |  |  | (58,608) |  |  | — |  |  | (58,608) |
Transaction costs and other |  |  |  |  |  |  | (11,386) |  |  | (9,000) |  |  | (20,386) |
Amortization of intangible assets |  |  |  |  |  |  | (105,670) |  |  | — |  |  | (105,670) |
Interest expense |  |  |  |  |  |  | (101,019) |  |  | (19,465) |  |  | (120,484) |
Net foreign exchange gains (losses) |  |  |  |  |  |  | 58,711 |  |  | 10,691 |  |  | 69,402 |
Income (loss) before income taxes |  |  |  |  |  |  | 877,904 |  |  | (36,132) |  |  | 841,772 |
Income tax benefit |  |  |  |  |  |  | (113,924) |  |  | (27) |  |  | (113,951) |
Net income |  |  |  |  |  |  | 763,980 |  |  | (36,159) |  |  | 727,821 |
Amounts attributable to redeemable noncontrolling interests |  |  |  |  |  |  | — |  |  | (18,357) |  |  | (18,357) |
Amounts attributable to nonredeemable noncontrolling interests |  |  |  |  |  |  | — |  |  | 48,507 |  |  | 48,507 |
Net income (loss) available to Arch |  |  |  |  |  |  | 763,980 |  |  | (6,009) |  |  | 757,971 |
Preferred dividends |  |  |  |  |  |  | (41,645) |  |  | — |  |  | (41,645) |
Loss on redemption of preferred shares |  |  |  |  |  |  | (2,710) |  |  | — |  |  | (2,710) |
Net income (loss) available to Arch common shareholders |  |  |  |  |  |  | $ | 719,625 |  |  | $ | (6,009) |  |  | $ | 713,616 |
Underwriting Ratios |  |  |  |  |  |  |  |  |  |  |
Loss ratio | 68.9 | % |  | 67.1 | % |  | 6.9 | % |  | 52.6 | % |  | 76.2 | % |  | 55.2 | %
Acquisition expense ratio | 15.9 | % |  | 16.8 | % |  | 10.0 | % |  | 14.6 | % |  | 21.7 | % |  | 15.4 | %
Other operating expense ratio | 16.5 | % |  | 10.6 | % |  | 12.0 | % |  | 13.8 | % |  | 6.5 | % |  | 13.0 | %
Combined ratio | 101.3 | % |  | 94.5 | % |  | 28.9 | % |  | 81.0 | % |  | 104.4 | % |  | 83.6 | %
Goodwill and intangible assets | $ | 114,012 |  |  | $ | — |  |  | $ | 513,258 |  |  | $ | 627,270 |  |  | $ | 7,650 |  |  | $ | 634,920 |
Total investable assets |  |  |  |  |  |  | $ | 19,566,861 |  |  | $ | 2,757,663 |  |  | $ | 22,324,524 |
Total assets |  |  |  |  |  |  | 28,845,473 |  |  | 3,372,856 |  |  | 32,218,329 |
Total liabilities |  |  |  |  |  |  | 19,518,395 |  |  | 2,262,255 |  |  | 21,780,650 |
(1) Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.
Summary of information regarding net premiums written and earned by major line of business and net premiums written by location | The following tables provide summary information regarding net premiums earned by major line of business and net premiums written by underwriting location:
INSURANCE SEGMENT | Year Ended December 31,
2020 |  | 2019 |  | 2018
Net premiums earned (1) |  |  |  |  |
Property, energy, marine and aviation | $ | 517,247 |  |  | $ | 298,966 |  |  | $ | 205,069 |
Professional Lines (2) | 655,872 |  | 499,224 |  | 458,425
Programs | 432,854 |  | 414,103 |  | 389,186
Construction and national accounts | 387,934 |  | 325,687 |  | 322,440
Excess and surplus casualty (3) | 270,620 |  | 200,615 |  | 172,424
Travel, accident and health | 190,944 |  | 305,085 |  | 297,147
Lenders products | 114,687 |  | 66,079 |  | 94,248
Other (4) | 301,262 |  | 287,321 |  | 266,722
Total | $ | 2,871,420 |  |  | $ | 2,397,080 |  |  | $ | 2,205,661 |
Net premiums written by underwriting location (1) |  |  |  |  |
United States | $ | 2,158,415 |  |  | $ | 1,983,476 |  |  | $ | 1,736,651 |
Europe | 856,572 |  | 559,214 |  | 401,974
Other | 147,920 |  |  | 99,036 |  |  | 73,500 |
Total | $ | 3,162,907 |  |  | $ | 2,641,726 |  |  | $ | 2,212,125 |
(1) Insurance segment results include premiums assumed through intersegment transactions and exclude premiums ceded through intersegment transactions. (2) Includes professional liability, executive assurance and healthcare business. (3) Includes casualty and contract binding business. (4) Includes alternative markets, excess workers' compensation and surety business.
REINSURANCE SEGMENT | Year Ended December 31,
2020 |  | 2019 |  | 2018
Net premiums earned (1) |  |  |  |  |
Property excluding property catastrophe | $ | 562,208 |  |  | $ | 362,841 |  |  | $ | 287,788 |
Property catastrophe | 237,736 |  | 90,934 |  | 75,249
Other Specialty (2) | 626,409 |  | 478,517 |  | 474,568
Casualty (3) | 549,056 |  | 429,288 |  | 347,034
Marine and aviation | 109,624 |  | 48,274 |  | 39,238
Other (4) | 77,196 |  | 56,535 |  | 37,339
Total | $ | 2,162,229 |  |  | $ | 1,466,389 |  |  | $ | 1,261,216 |
Net premiums written by underwriting location (1) |  |  |  |  |
United States | $ | 687,622 |  |  | $ | 529,943 |  |  | $ | 413,550 |
Bermuda | 1,001,990 |  | 578,618 |  | 487,523 |
Europe and other | 767,758 |  | 494,162 |  | 471,499 |
Total | $ | 2,457,370 |  |  | $ | 1,602,723 |  |  | $ | 1,372,572 |
(1) Reinsurance segment results include premiums assumed through intersegment transactions and exclude premiums ceded through intersegment transactions. (2) Includes proportional motor, surety, accident and health, workers’ compensation catastrophe, agriculture, trade credit and other. (3) Includes executive assurance, professional liability, workers’ compensation, excess motor, healthcare and other. (4) Includes life, casualty clash and other.
MORTGAGE SEGMENT | Year Ended December 31,
2020 |  | 2019 |  | 2018
Net premiums earned by underwriting location |  |  |  |  |
United States | $ | 1,158,563 |  |  | $ | 1,134,849 |  |  | $ | 1,009,765 |
Other | 239,372 |  |  | 231,491 |  |  | 176,471 |
Total | $ | 1,397,935 |  |  | $ | 1,366,340 |  |  | $ | 1,186,236 |
Net premiums written by underwriting location |  |  |  |  |
United States | $ | 1,021,950 |  |  | $ | 1,032,868 |  |  | $ | 948,323 |
Other | 257,900 |  |  | 228,888 |  |  | 209,552 |
Total | $ | 1,279,850 |  |  | $ | 1,261,756 |  |  | $ | 1,157,875 |
OTHER SEGMENT | Year Ended December 31,
2020 |  | 2019 |  | 2018
Net premiums earned (1) |  |  |  |  |
Casualty (2) | $ | 245,272 |  |  | $ | 246,894 |  |  | $ | 277,589 |
Other specialty (3) | 186,717 |  |  | 185,547 |  |  | 204,485 |
Property catastrophe | 23,037 |  |  | 13,399 |  |  | 10,998 |
Property excluding property catastrophe | 1,130 |  |  | 3,503 |  |  | 2,802 |
Marine and aviation | 429 |  |  | — |  |  | — |
Other (4) | 103,766 |  |  | 107,346 |  |  | 82,988 |
Total | $ | 560,351 |  |  | $ | 556,689 |  |  | $ | 578,862 |
Net premiums written by underwriting location (1) |  |  |  |  |
United States | $ | 115,471 |  |  | $ | 127,176 |  |  | $ | 49,800 |
Europe | 97,753 |  |  | 52,065 |  |  | 91,635 |
Bermuda | 324,365 |  |  | 353,621 |  |  | 462,740 |
Total | $ | 537,589 |  |  | $ | 532,862 |  |  | $ | 604,175 |
(1) Other segment results include premiums assumed through intersegment transactions and exclude premiums ceded through intersegment transactions. (2) Includes professional liability, excess motor, programs and other. (3) Includes proportional motor and other. (4) Includes mortgage, US programs and other.

X
- Definition Tabular disclosure of premiums written and earned by major line of business, and of net premiums by both client location and underwriting location. + References No definition available. + Details
Name: | acgl_ScheduleOfSegmentReportingInformationByLineOfBusinessAndLocationTableTextBlock
Namespace Prefix: | acgl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 + Details
Name: | us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration