Fair Value Measurements - Valuation of Financial Instruments Carried at Fair Value (Details) - USD ($) $ in Millions	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014
Assets:
Royalty rights - at fair value	$ 4,020.0
Measured on a recurring basis
Assets:
Royalty rights - at fair value			$ 5,310.0
Measured on a recurring basis | Level 1
Assets:
Investment securities	40.0		14.9
Measured on a recurring basis | Level 2
Assets:
Foreign currency forward contracts	4.3		4.8
Funds associated with Israeli post-employment benefits	16.3		17.2
Total level 2 assets	20.6		22.0
Liabilities:
Interest rate swap agreements	0.0		0.3
Foreign currency forward contracts	2.8		3.9
Total level 2 liabilities	2.8		4.2
Measured on a recurring basis | Level 3 | Contingent consideration classified as equity
Liabilities:
Contingent consideration	44.9	$ 48.0	17.9	$ 0.0	$ 12.4	$ 12.4
Measured on a non-recurring basis | Level 3
Assets:
Indefinite-lived intangible assets	0.0		1,031.8
Assets held for sale, net	70.1		37.5
Total level 2 assets	$ 70.1		$ 1,069.3