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Stock compensation - RSU and PSU award activity (Details) - $ / shares
 1 Months Ended 3 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Mar. 31, 2019
Restricted Stock Units (RSUs)      
Shares Available For Grant      
Shares Available for Grant Beginning Balance (in shares)     545,751
Granted (in shares)     (165,251)
Cancelled (in shares)     55,591
Shares Available for Grant Ending Balance (in shares)     401,040
Shares Subject to Outstanding Options, Shares      
Outstanding at the beginning of the period (in shares)     2,043,337
Granted (in shares)   190,000,000 165,251
Cancelled (in shares)     (55,591)
Released (in shares)     (213,604)
Outstanding at the end of the period (in shares)     1,974,444
Shares Subject to Outstanding Options, Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share)     $ 80.35
Granted (in dollars per share)     73.69
Cancelled (in dollars per share)     89.46
Released (in dollars per share)     89.38
Outstanding at the end of the period (in dollars per share)     $ 78.29
Performance Stock Units (PSUs)      
Shares Available For Grant      
Achieved (in shares)     (44,940)
Cancelled (in shares)     9,889
Shares Subject to Outstanding Options, Shares      
Granted (in shares) 77,243 446,500,000  
Achieved (in shares)     44,940
Cancelled (in shares)     (9,889)
Shares Subject to Outstanding Options, Weighted Average Exercise Price      
Achieved (in dollars per share)     $ 65.76
Cancelled (in dollars per share)     $ 67.32