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Pension and post-retirement benefits (Details)
$ in Millions
Jun. 30, 2016
USD ($)
Qualified Union Hourly Defined Benefit Pension Plan  
Defined Benefit Plan Disclosure  
Discount Rate 4.00%
Projected Benefit Obligation $ 19.3
Fair value of Plan Assets 19.8
Funded (unfunded) Status $ 0.5
Non-Qualified Defined Benefit Pension Plan  
Defined Benefit Plan Disclosure  
Discount Rate 3.75%
Projected Benefit Obligation $ 4.9
Other Post-retirement Benefit Plans  
Defined Benefit Plan Disclosure  
Discount Rate 3.75%
Projected Benefit Obligation $ 0.8