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Segment information - Reconciliation of Total Business Segment Assets to Consolidated Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,504.0	$ 2,457.6	$ 2,542.4
Cash and cash equivalents	538.8	605.0	733.9
Deferred income taxes	114.0	109.3	119.9
Operating lease right-of-use assets	127.1
Prepaid postretirement assets	136.2	147.6	148.3
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,450.9	1,436.6	1,364.5
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,053.1	1,021.0	1,177.9
Other corporate assets	$ 137.0	$ 159.1	$ 175.8

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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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