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Fair value measurements (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Assets:    
Cash equivalents $ 5.1 $ 10.0
Liabilities:    
Deferred compensation arrangement 0.3  
Level 1    
Assets:    
Cash equivalents 5.1 $ 10.0
Liabilities:    
Deferred compensation arrangement $ 0.3