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Segment information - Reconciliation of Total Business Segment Assets to Consolidated Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,707.9	$ 2,504.0	$ 2,457.6
Cash and cash equivalents	898.5	538.8	605.0
Deferred income taxes	136.2	114.0	109.3
Operating lease right-of-use assets	79.3	71.4	0.0
Prepaid postretirement assets	187.5	136.2	147.6
Assets of discontinued operations	0.0	243.2	181.9
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,302.3	1,263.4	1,254.7
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,405.6	1,240.6	1,202.9
Other corporate assets	$ 104.1	$ 137.0	$ 159.1

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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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