Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 29, 2018	Jun. 29, 2018	Dec. 29, 2017
Disaggregation of Revenue [Line Items]
Revenue Reserves	$ 93.4	$ 93.4	$ 65.5
Revenue Reserve Provision		156.7
Revenue Reserve Payments or Credits		(128.8)
Deferred Revenue, Revenue Recognized		14.6
Contract with Customer, Liability	25.4	25.4	20.2
Contract with Customer, Liability, Current	20.2	20.2	13.9
Capitalized Contract Cost, Gross	27.9	27.9
Capitalized Contract Cost, Amortization		6.8
Contract with Customer, Liability, Noncurrent	$ 5.2	$ 5.2	6.3
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue	79.10%	77.30%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue	20.90%	22.70%
Amitiza [Member]
Disaggregation of Revenue [Line Items]
Royalty Revenue	$ 21.6	$ 29.6
Rebates and Chargebacks [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	88.5	88.5	60.3
Revenue Reserve Provision		147.7
Revenue Reserve Payments or Credits		(119.5)
Allowance for Sales Returns [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	3.6	3.6	4.1
Revenue Reserve Provision		4.1
Revenue Reserve Payments or Credits		(4.6)
Other Sales Deductions [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	$ 1.3	1.3	$ 1.1
Revenue Reserve Provision		4.9
Revenue Reserve Payments or Credits		$ (4.7)