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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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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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