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Discontinued Operations - Loss, Assets and Liabilities of Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss from discontinued operations, net of income taxes $ (3.4) $ (1.3)  
Discontinued Operations, Held-for-sale or Disposed of by Sale      
Liabilities:      
Accounts payable and accrued expenses 54.0   $ 54.0
Other noncurrent liabilities 141.3   141.0
Total liabilities classified as discontinued operations $ 195.3   $ 195.0