XML 124 R109.htm IDEA: XBRL DOCUMENT
v3.20.4

Commitments, Contingencies and Off-Balance Sheet Arrangements - Contractual Obligations (Detail) $ in Millions | Dec. 31, 2020 USD ($)
--- | ---
Note Purchase Agreements [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Contractual Obligations, Payments Due by Period, 2021 | $ 75.0
Contractual Obligations, Payments Due by Period, 2022 | 200.0
Contractual Obligations, Payments Due by Period, 2023 | 250.0
Contractual Obligations, Payments Due by Period, 2024 | 475.0
Contractual Obligations, Payments Due by Period, 2025 | 200.0
Contractual Obligations, Payments Due by Period, Thereafter | 3,148.0
Contractual Obligations, Payments Due by Period, Total | 4,348.0
Premium Financing Debt Facility [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Contractual Obligations, Payments Due by Period, 2021 | 203.6
Contractual Obligations, Payments Due by Period, Total | 203.6
Interest On Debt [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Contractual Obligations, Payments Due by Period, 2021 | 189.5
Contractual Obligations, Payments Due by Period, 2022 | 183.6
Contractual Obligations, Payments Due by Period, 2023 | 174.7
Contractual Obligations, Payments Due by Period, 2024 | 158.0
Contractual Obligations, Payments Due by Period, 2025 | 143.4
Contractual Obligations, Payments Due by Period, Thereafter | 601.9
Contractual Obligations, Payments Due by Period, Total | 1,451.1
Total Debt Obligations [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Contractual Obligations, Payments Due by Period, 2021 | 468.1
Contractual Obligations, Payments Due by Period, 2022 | 383.6
Contractual Obligations, Payments Due by Period, 2023 | 424.7
Contractual Obligations, Payments Due by Period, 2024 | 633.0
Contractual Obligations, Payments Due by Period, 2025 | 343.4
Contractual Obligations, Payments Due by Period, Thereafter | 3,749.9
Contractual Obligations, Payments Due by Period, Total | 6,002.7
Operating Lease Obligations [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Contractual Obligations, Payments Due by Period, 2021 | 108.5
Contractual Obligations, Payments Due by Period, 2022 | 93.9
Contractual Obligations, Payments Due by Period, 2023 | 75.1
Contractual Obligations, Payments Due by Period, 2024 | 54.8
Contractual Obligations, Payments Due by Period, 2025 | 41.6
Contractual Obligations, Payments Due by Period, Thereafter | 77.8
Contractual Obligations, Payments Due by Period, Total | 451.7
Less Sublease Arrangements [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Contractual Obligations, Payments Receivable by Period, 2021 | (0.3)
Contractual Obligations, Payments Receivable by Period, 2022 | (0.3)
Contractual Obligations, Payments Receivable by Period, 2023 | (0.2)
Contractual Obligations, Payments Receivable by Period, 2024 | (0.2)
Contractual Obligations, Payments Receivable by Period, 2025 | (0.2)
Contractual Obligations, Payments Receivable by Period, Thereafter | (0.5)
Contractual Obligations, Payments Receivable by Period, Total | (1.7)
Outstanding Purchase Obligations [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Contractual Obligations, Payments Due by Period, 2021 | 75.3
Contractual Obligations, Payments Due by Period, 2022 | 49.4
Contractual Obligations, Payments Due by Period, 2023 | 30.8
Contractual Obligations, Payments Due by Period, 2024 | 21.9
Contractual Obligations, Payments Due by Period, 2025 | 16.7
Contractual Obligations, Payments Due by Period, Thereafter | 22.7
Contractual Obligations, Payments Due by Period, Total | 216.8
Total Contractual Obligations [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Contractual Obligations, Payments Due by Period, 2021 | 651.6
Contractual Obligations, Payments Due by Period, 2022 | 526.6
Contractual Obligations, Payments Due by Period, 2023 | 530.4
Contractual Obligations, Payments Due by Period, 2024 | 709.5
Contractual Obligations, Payments Due by Period, 2025 | 401.5
Contractual Obligations, Payments Due by Period, Thereafter | 3,849.9
Contractual Obligations, Payments Due by Period, Total | $ 6,669.5

X
- Definition Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] + References No definition available. + Details
Name: | ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems
Namespace Prefix: | ajg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recorded unconditional purchase obligation receivable. + References No definition available. + Details
Name: | ajg_RecordedUnconditionalPurchaseObligationReceivable
Namespace Prefix: | ajg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded unconditional purchase obligation receivable after fifth year. + References No definition available. + Details
Name: | ajg_RecordedUnconditionalPurchaseObligationReceivableAfterFifthYear
Namespace Prefix: | ajg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded unconditional purchase obligation receivable in fifth year. + References No definition available. + Details
Name: | ajg_RecordedUnconditionalPurchaseObligationReceivableInFifthYear
Namespace Prefix: | ajg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded unconditional purchase obligation receivable in fourth year. + References No definition available. + Details
Name: | ajg_RecordedUnconditionalPurchaseObligationReceivableInFourthYear
Namespace Prefix: | ajg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded unconditional purchase obligation receivable in second year. + References No definition available. + Details
Name: | ajg_RecordedUnconditionalPurchaseObligationReceivableInSecondYear
Namespace Prefix: | ajg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded unconditional purchase obligation receivable in third year. + References No definition available. + Details
Name: | ajg_RecordedUnconditionalPurchaseObligationReceivableInThirdYear
Namespace Prefix: | ajg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded unconditional purchase obligation receivable within one year. + References No definition available. + Details
Name: | ajg_RecordedUnconditionalPurchaseObligationReceivableWithinOneYear
Namespace Prefix: | ajg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of recorded unconditional purchase obligation maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of recorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of recorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of recorded unconditional purchase obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of recorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of recorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ajg_NotePurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ajg_PremiumFinancingDebtFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ajg_InterestOnDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ajg_DebtObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ajg_OperatingLeaseObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ajg_SubleaseArrangementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ajg_OutstandingPurchaseObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ajg_ContractualObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |