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Fair value measurements - Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Liabilities:        
Share-based compensation   $ 4.9 $ 0.8  
Fair Value, Measurements, Recurring        
Assets:        
Equity investments $ 2.2 2.2    
Liabilities:        
Deferred compensation arrangement 1.5 1.5   $ 0.7
Separation-related Reimbursement Awards 0.9 0.9   2.1
Total liabilities 2.4 2.4   2.8
Share-based compensation 0.1 0.3    
Fair Value, Measurements, Recurring | Level 1        
Assets:        
Equity investments 2.2 2.2    
Liabilities:        
Deferred compensation arrangement 1.5 1.5   0.7
Separation-related Reimbursement Awards 0.9 0.9   2.1
Total liabilities $ 2.4 $ 2.4   $ 2.8