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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended	12 Months Ended
	Dec. 18, 2013	Apr. 02, 2016	Dec. 31, 2015	Mar. 28, 2015	Dec. 31, 2015	Jun. 27, 2015	May 01, 2014	Nov. 08, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Discount rate		7.62%			7.72%
Growth rate		1.80%	3.40%
Reduction in cumulative cash flows (percent)		3.00%
Decrease in fair value due to change in discount rate		$ 204.4		$ (100.8)
Decrease in fair value if discount rate increases by 0.5%		240.0	$ 260.0		$ 260.0
Increase in fair value if discount rate decreases by 0.5%		260.0	270.0		270.0
Increase in fair value if royalty rate increases by 5.0%		260.0	270.0		270.0
Decrease in fair value if royalty rate decreases by 5.0%		260.0	280.0		280.0
Accounts receivable		1,188.0	1,189.0		1,189.0
Debt, carrying value		5,937.1	4,698.3		4,698.3			$ 2,300.0
Public bonds and private placement notes
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, carrying value		5,100.0	3,900.0		3,900.0
Public bonds and private placement notes \| Level 1
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, fair value		5,100.0				$ 3,800.0
Retail bonds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, carrying value		837.1	798.3		798.3
Debt, unamortized premium		76.5	82.5		82.5
Retail bonds \| Level 2
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, fair value		905.5	859.8		859.8
Tysabri® \| Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percent of royalty revenues generated by specific agreement						18.00%
Elan
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition date	Dec. 18, 2013
Royalty rights \| Tysabri®
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percent of royalty revenues generated by specific agreement							12.00%
Accounts receivable		$ 85.6	$ 83.4		$ 83.4
Royalty rights \| Tysabri® \| Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net sales						$ 2,000.0
Royalty rights \| Tysabri® \| Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percent of royalty revenues generated by specific agreement						25.00%
Net sales						$ 2,000.0