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Goodwill and other intangible assets, net - Maturity (Details)
$ in Millions
Jun. 30, 2016
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity  
2016 $ 2.6
2017 2.4
2018 1.7
2019 1.5
2020 $ 0.5