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Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Less: Income from discontinued operations $ 0.1 $ 0.0 $ 0.1 $ 0.0  
Discontinued Operations, Disposed of by Sale [Member]          
Assets of discontinued operations:          
Current assets 1.0   1.0   $ 1.0
Other assets 2.4   2.4   2.5
Liabilities of discontinued operations:          
Current liabilities $ 0.2   $ 0.2   $ 0.1