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Right of use assets and lease liabilities (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Right-of-Use Asset $ 3.0
Operating Lease, Right-of-Use Asset 79.4
Finance Lease, Liability 3.0
Operating Lease, Liability 79.4
Property, Plant and Equipment [Member]  
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Right-of-Use Asset 3.0
Operating Lease, Right-of-Use Asset 0.0
Other Assets and Deferred Charges [Member]  
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Right-of-Use Asset 0.0
Operating Lease, Right-of-Use Asset 79.4
Accrued expenses and other [Member]  
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Liability 0.8
Operating Lease, Liability 22.0
Postretirement benefits and other long-term liabilities [Member]  
Right of use assets and lease liabilities [Line Items]  
Finance Lease, Liability 2.2
Operating Lease, Liability $ 57.4