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Acquisitions and Divestitures - 2017 Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) acquisition | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |
Goodwill | $ 845.5 | $ 835.8 | $ 675.8
Aviation segment |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 326.9 | 266.8 | 173.7
Land segment |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 518.5 | $ 496.7 | $ 430.7
Acquisitions 2017 |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquired | acquisition | 5 |  |
Goodwill | $ 63.5 |  |
Goodwill anticipated to be deductible for tax purposes | 29.5 |  |
Acquisitions 2017 | Customer relationships |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 41.7 |  |
Weighted average amortizable lives of identifiable intangible assets | 8 years |  |
Acquisitions 2017 | Aviation segment |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 51.3 |  |
Acquisitions 2017 | Land segment |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 12.2 |  |

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