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Revenue from Contracts with Customers - Summary of Expected Revenue Related to Performance Obligations (Detail)
$ in Millions
Sep. 30, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations $ 472.7
2018 (Remaining Three Months) [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 207.6
2019 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 182.0
2020 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 37.4
2021 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 14.2
2022 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 8.3
Thereafter [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 23.2
Brokerage [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 297.0
Brokerage [Member] | 2018 (Remaining Three Months) [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 157.8
Brokerage [Member] | 2019 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 122.8
Brokerage [Member] | 2020 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 13.9
Brokerage [Member] | 2021 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 1.3
Brokerage [Member] | 2022 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 0.5
Brokerage [Member] | Thereafter [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 0.7
Risk Management [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 175.7
Risk Management [Member] | 2018 (Remaining Three Months) [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 49.8
Risk Management [Member] | 2019 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 59.2
Risk Management [Member] | 2020 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 23.5
Risk Management [Member] | 2021 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 12.9
Risk Management [Member] | 2022 [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations 7.8
Risk Management [Member] | Thereafter [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected revenue related to performance obligations $ 22.5