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Segment information - Reconciliation of Total Business Segment Assets to Consolidated Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 2,542.4 | $ 2,021.6 | $ 2,130.0
Cash and cash equivalents | 733.9 | 370.6 | 365.2
Deferred income taxes | 119.9 | 146.1 | 127.4
Prepaid postretirement assets | 148.3 | 33.3 | 45.1
Operating Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,364.5 | 1,339.0 | 1,486.0
Corporate |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,177.9 | 682.6 | 644.0
Other corporate assets | $ 175.8 | $ 132.6 | $ 106.3

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