Accounts Receivable, net - Revenue reserve information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jul. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Accounts receivable, net
Settlement payment				$ 9.4
Reimbursement of overpayment				$ 8.1
ASU 2014-09
Accounts receivable, net
Net adjustment to opening retained earnings and accounts receivable	$ 3.2
Failure-to-supply reserves offset	3.5
Timing of recognition of contract manufacturing arrangements	$ 0.3
Chargebacks
Accounts receivable, net
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		47.20%	53.00%	49.30%	53.50%
Rebates
Accounts receivable, net
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		13.80%	12.50%	14.10%	12.50%
Returns
Accounts receivable, net
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		1.50%	1.80%	1.20%	1.60%
Other
Accounts receivable, net
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		6.80%	3.30%	5.00%	3.00%