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Gain (loss) on sales or impairment of long lived assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Impaired Long-Lived Assets Held and Used [Line Items]      
Asset Impairment Charges $ (9.1) $ (0.8) $ (1.5)
Gain Loss On Sale Or Impairment Of Long Lived Assets, Net $ (6.8) 8.4 (2.1)
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment 4.7    
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss $ 3.0 0.8 $ 1.2
Impairment of Tangible Assets, Other Descriptors     .3
Other Asset Impairment Charges $ 2.3 (10.6)  
Gain (Loss) on Disposition of Property Plant Equipment   (1.4) $ (0.6)
Gain (Loss) on Disposition of Assets   $ 9.2 $ (0.6)