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Dispositions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 26.5 $ 19.8 $ 23.0 $ 13.7
Property, Plant and Equipment, Additions 59.0 25.1 122.4 75.8
Beckjord [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest       (11.7)
Property, Plant and Equipment, Additions       14.5
Subsidiaries [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (Loss) on Disposition of Business 0.0 0.0 0.0 (12.4)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 37.7 $ 37.5 $ 108.8 73.9
Subsidiaries [Member] | Beckjord [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest       (12.4)
Property, Plant and Equipment, Additions       $ 14.5