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Discontinued Operations - Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Deferred tax assets | $ 0.5 | $ 1.1
Long-term assets of discontinued operations | 0.5 | 1.1
Accrued liabilities: |  |
Other current liabilities | 0.5 | 2.1
Current liabilities of discontinued operations | 0.5 | 2.1
Other long-term liabilities | 1.5 | 2.0
Long-term liabilities of discontinued operations | 1.5 | 2.0
Fire Rescue |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Deferred tax assets | 0.0 | 0.0
Long-term assets of discontinued operations | 0.0 | 0.0
Accrued liabilities: |  |
Other current liabilities | 0.0 | 1.3
Current liabilities of discontinued operations | 0.0 | 1.3
Other long-term liabilities | 0.0 | 0.0
Long-term liabilities of discontinued operations | 0.0 | 0.0
Other Disposal Groups |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Deferred tax assets | 0.5 | 1.1
Long-term assets of discontinued operations | 0.5 | 1.1
Accrued liabilities: |  |
Other current liabilities | 0.5 | 0.8
Current liabilities of discontinued operations | 0.5 | 0.8
Other long-term liabilities | 1.5 | 2.0
Long-term liabilities of discontinued operations | $ 1.5 | $ 2.0

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