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Segment information - Reconciliation of Total Business Segment Assets to Consolidated Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 2,457.6 | $ 2,542.4 | $ 2,021.6
Cash and cash equivalents | 605.0 | 733.9 | 370.6
Deferred income taxes | 109.3 | 119.9 | 146.1
Prepaid postretirement assets | 147.6 | 148.3 | 33.3
Operating Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,436.6 | 1,364.5 | 1,339.0
Corporate |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,021.0 | 1,177.9 | 682.6
Other corporate assets | $ 159.1 | $ 175.8 | $ 132.6

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