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Segment information - Reconciliation of Total Business Segment Assets to Consolidated Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]        
Total assets $ 2,021.6 $ 2,130.0 [1] $ 2,321.0  
Cash and cash equivalents 370.6 365.2 494.3 $ 639.8
Deferred income taxes 146.1 127.4 [1] 146.3  
Prepaid postretirement assets 33.3 45.1 19.9  
Operating Segments        
Segment Reporting, Asset Reconciling Item [Line Items]        
Total assets 1,339.0 1,486.0 1,533.8  
Corporate        
Segment Reporting, Asset Reconciling Item [Line Items]        
Total assets 682.6 644.0 787.2  
Other corporate assets $ 132.6 $ 106.3 $ 126.7  
[1] Changed to conform to the current-year presentation. See Note 5.