XML 44 R25.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Insurance (Tables) | 6 Months Ended
--- | ---
Apr. 30, 2018
Insurance [Abstract] |
Schedule of Insurance Related Balances and Activity | Insurance Related Balances and Activity
(in millions) | April 30, 2018 |  | October 31, 2017
Insurance claim reserves excluding medical and dental | $ | 495.7 |  |  | $ | 485.6 |
Medical and dental claim reserves | 10.0 |  |  | 9.8 |
Insurance recoverables | 74.9 |  |  | 73.1 |
Schedule of Instruments Used to Collateralize Insurance Obligations | Instruments Used to Collateralize Our Insurance Obligations
(in millions) | April 30, 2018 |  | October 31, 2017
Standby letters of credit | $ | 136.7 |  |  | $ | 137.6 |
Surety bonds | 78.2 |  |  | 77.5 |
Restricted insurance deposits | 10.4 |  |  | 11.2 |
Total | $ | 225.3 |  |  | $ | 226.3 |

X
- Definition Insurance Disclosure + References No definition available. + Details
Name: | abm_InsuranceDisclosureTableTextBlock
Namespace Prefix: | abm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Insurance Related Balances And Activity [Table Text Block] + References No definition available. + Details
Name: | abm_ScheduleOfInsuranceRelatedBalancesAndActivityTableTextBlock
Namespace Prefix: | abm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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