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Goodwill and other intangible assets, net - Amortization (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 0.7 $ 0.8 $ 1.3 $ 1.6