Restructuring Charges - Summary of Restructuring Reserve (Detail) $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 5.1
From ND Acquisition	14.9
Charges Incurred	17.9
Payments	(4.8)
Ending balance	33.1
Operating Segments \| Transportation
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
From ND Acquisition	5.2
Charges Incurred	1.3
Payments	(0.4)
Ending balance	6.1
Operating Segments \| Transportation \| Contract termination
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
From ND Acquisition	0.1
Charges Incurred	0.0
Payments	0.0
Ending balance	0.1
Operating Segments \| Transportation \| Facilities
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
From ND Acquisition	0.0
Charges Incurred	0.8
Payments	0.0
Ending balance	0.8
Operating Segments \| Transportation \| Severance
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
From ND Acquisition	5.1
Charges Incurred	0.5
Payments	(0.4)
Ending balance	5.2
Operating Segments \| Logistics
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
From ND Acquisition	9.7
Charges Incurred	13.3
Payments	(1.2)
Ending balance	21.8
Operating Segments \| Logistics \| Contract termination
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
From ND Acquisition	0.3
Charges Incurred	1.0
Payments	(0.1)
Ending balance	1.2
Operating Segments \| Logistics \| Facilities
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
From ND Acquisition	0.0
Charges Incurred	0.5
Payments	0.0
Ending balance	0.5
Operating Segments \| Logistics \| Severance
Restructuring Reserve [Roll Forward]
Beginning balance	0.0
From ND Acquisition	9.4
Charges Incurred	11.8
Payments	(1.1)
Ending balance	20.1
Corporate
Restructuring Reserve [Roll Forward]
Beginning balance	5.1
From ND Acquisition	0.0
Charges Incurred	3.3
Payments	(3.2)
Ending balance	5.2
Corporate \| Contract termination
Restructuring Reserve [Roll Forward]
Beginning balance	3.8
From ND Acquisition	0.0
Charges Incurred	3.3
Payments	(2.2)
Ending balance	4.9
Corporate \| Severance
Restructuring Reserve [Roll Forward]
Beginning balance	1.3
From ND Acquisition	0.0
Charges Incurred	0.0
Payments	(1.0)
Ending balance	$ 0.3

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

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Net total Increase or Decrease in the accrual for restructuring costs during the reporting period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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