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Restructuring Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Balance as of December 31, 2017 |  |  | $ 32.0 |  |
Severance and other restructuring-related costs | $ 17.1 | $ 59.6 |  | $ 59.6 | $ 0.0
Paid during the period | (28.5) |  |  |  |
Restructuring charges as of December 31, 2018 | 20.7 | 32.0 | 20.7 | 32.0 |
Corporate |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Balance as of December 31, 2017 |  |  | 5.0 |  |
Severance and other restructuring-related costs | 4.5 |  |  |  |
Paid during the period | (5.5) |  |  |  |
Restructuring charges as of December 31, 2018 | 4.0 | 5.0 | 4.0 | 5.0 |
Aviation segment | Operating Segments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Balance as of December 31, 2017 |  |  | 0.7 |  |
Severance and other restructuring-related costs | 1.6 |  |  |  |
Paid during the period | (0.8) |  |  |  |
Restructuring charges as of December 31, 2018 | 1.4 | 0.7 | 1.4 | 0.7 |
Land segment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Severance and other restructuring-related costs |  |  | 17.1 | 52.4 |
Land segment | Operating Segments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Balance as of December 31, 2017 |  |  | 25.0 |  |
Severance and other restructuring-related costs | 6.5 |  |  |  |
Paid during the period | (18.9) |  |  |  |
Restructuring charges as of December 31, 2018 | 12.6 | 25.0 | 12.6 | 25.0 |
Marine segment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Severance and other restructuring-related costs |  |  |  | 1.4 |
Marine segment | Operating Segments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Balance as of December 31, 2017 |  |  | 1.3 |  |
Severance and other restructuring-related costs | 4.5 |  |  |  |
Paid during the period | (3.3) |  |  |  |
Restructuring charges as of December 31, 2018 | $ 2.6 | $ 1.3 | $ 2.6 | $ 1.3 |

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