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Acquisitions and Divestitures - 2014 Narrative (Details) location in Thousands, £ in Millions, $ in Millions				12 Months Ended
	Jul. 29, 2014 USD ($) location	Mar. 07, 2014 GBP (£)	Mar. 07, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) acquisition	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Escrow payment related to an assumed obligation of an acquired business				$ 0.0		$ 0.0	$ 21.7
Goodwill				835.8			653.3	$ 675.8
Aviation segment
Business Acquisition [Line Items]
Goodwill				266.8			174.3	173.7
Marine segment
Business Acquisition [Line Items]
Goodwill				$ 72.3			73.1	71.4
Watson Petroleum
Business Acquisition [Line Items]
Purchase price			$ 164.3
Escrow payment related to an assumed obligation of an acquired business		£ 13.0	$ 21.7
Amounts due to sellers					£ 3.4			$ 5.1
Additional estimated amounts due to seller					£ 2.1	$ 3.0
Colt
Business Acquisition [Line Items]
Purchase price	$ 72.9
Number of locations (more than) | location	3
2014 Acquisitions
Business Acquisition [Line Items]
Purchase price							295.8
Goodwill							177.8
Goodwill anticipated to be deductible for tax purposes							22.4
Identifiable intangible assets							83.5
2014 Acquisitions | Trademark/Trade name rights
Business Acquisition [Line Items]
Identifiable intangible assets							11.5
2014 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets							$ 55.5
Weighted average amortizable lives of identifiable intangible assets							4 years 10 months 8 days
2014 Acquisitions | Other
Business Acquisition [Line Items]
Identifiable intangible assets							$ 16.5
Weighted average amortizable lives of identifiable intangible assets							5 years
2014 Acquisitions | Aviation segment
Business Acquisition [Line Items]
Number of acquisitions | acquisition							2
2014 Acquisitions | Marine segment
Business Acquisition [Line Items]
Number of acquisitions | acquisition							1

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The number of businesses acquired by the entity during the period.

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