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Discontinued Operations - Assets and Liabilities of Discontinued Operations (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Deferred tax assets $ 0.4 $ 0.5
Long-term assets of discontinued operations 0.4 0.5
Accrued liabilities:    
Other current liabilities 0.2 0.5
Current liabilities of discontinued operations 0.2 0.5
Other long-term liabilities 1.4 1.5
Long-term liabilities of discontinued operations 1.4 1.5
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 0.0
Current liabilities of discontinued operations 0.0 0.0
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 0.4 0.5
Long-term assets of discontinued operations 0.4 0.5
Accrued liabilities:    
Other current liabilities 0.2 0.5
Current liabilities of discontinued operations 0.2 0.5
Other long-term liabilities 1.4 1.5
Long-term liabilities of discontinued operations $ 1.4 $ 1.5