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Restructuring - Summary of Impairment by Reportable Business Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairments |  | $ 25.6 | $ 0.0 | $ 0.0
Restructuring, 2020 Initiative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairments | $ 18.6 | 18.6 |  |
Operating Segments | Aviation segment | Restructuring, 2020 Initiative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairments |  | 6.9 |  |
Operating Segments | Land segment | Restructuring, 2020 Initiative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairments |  | 5.9 |  |
Operating Segments | Marine segment | Restructuring, 2020 Initiative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairments |  | 4.0 |  |
Corporate | Restructuring, 2020 Initiative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairments |  | $ 1.8 |  |

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