Fair Value Measurements - Additional Information (Details)			3 Months Ended																			6 Months Ended			12 Months Ended					15 Months Ended
	Mar. 30, 2015	Dec. 18, 2013 USD ($)	Dec. 31, 2016 USD ($)		Oct. 01, 2016 USD ($)		Jul. 02, 2016 USD ($)	[3]	Apr. 02, 2016 USD ($)		Dec. 31, 2015 USD ($)		Sep. 26, 2015 USD ($)	[6]	Jun. 27, 2015 USD ($)		Mar. 28, 2015 USD ($)	[8]	Dec. 27, 2014 USD ($)	[9]	Sep. 27, 2014 USD ($)	Oct. 03, 2016	Dec. 31, 2015 USD ($)	Dec. 27, 2014 USD ($)	Dec. 31, 2016 USD ($) segments	Dec. 31, 2015 USD ($)	Jun. 27, 2015 USD ($)	Jun. 28, 2014 USD ($)	May 01, 2014	Oct. 01, 2016 USD ($)	Nov. 08, 2013 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of Reporting Units | segments																									9
Average growth rate			2.00%								3.40%											2.00%
Royalty rights - change in fair value			$ (1,115,600,000)	[1]	$ 377,400,000	[2]	$ 910,800,000		$ 204,400,000	[4]	$ (116,600,000)	[5]	$ (173,800,000)		$ 69,200,000	[7]	$ (100,800,000)		$ 105,800,000		$ (58,900,000)		$ (57,300,000)	$ (46,900,000)	$ 2,608,200,000		$ (78,500,000)	$ (26,600,000)
Discount rate																										7.72%	7.83%
Decrease in fair value if discount rate increases by 0.5%											260,000,000				260,000,000								260,000,000			$ 260,000,000	$ 260,000,000
Increase in fair value if discount rate decreases by 0.5%											270,000,000				290,000,000								270,000,000			270,000,000	290,000,000
Increase in fair value if royalty rate increases by 5.0%											270,000,000				280,000,000								270,000,000			270,000,000	280,000,000
Decrease in fair value if royalty rate decreases by 5.0%											280,000,000				280,000,000								280,000,000			280,000,000	280,000,000
Goodwill impairment charge			224,100,000		$ 737,900,000				$ 130,500,000														0		1,092,500,000			0
Definite lived asset impairment																							185,100,000		665,600,000		0	0
Goodwill			4,049,400,000								5,152,700,000				4,721,200,000								5,152,700,000		4,049,400,000	5,152,700,000	4,721,200,000	3,473,100,000
Definite-lived intangible assets, fair value			114,500,000								1,916,300,000				2,263,100,000								1,916,300,000		114,500,000	1,916,300,000	2,263,100,000
Senior notes			5,373,100,000								4,698,300,000				4,720,900,000								4,698,300,000		5,373,100,000	4,698,300,000	4,720,900,000				$ 2,300,000,000
CHCI
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Royalty rights - change in fair value																							0		0		0	0
Goodwill impairment charge																									868,400,000		0
Goodwill			1,070,800,000								1,983,200,000				1,530,200,000								1,983,200,000		1,070,800,000	1,983,200,000	1,530,200,000	$ 248,200,000
Omega Restated
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effective date of acquisition	Mar. 30, 2015
Goodwill											1,688,700,000												1,688,700,000			1,688,700,000
Omega Restated | Brands
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Definite lived asset impairment																							185,100,000		1,500,000,000					$ 290,900,000
Elan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effective date of acquisition		Dec. 18, 2013
Goodwill		$ 2,332,000,000
Public Bonds and Private Placement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes			4,600,000,000								3,900,000,000				3,900,000,000								3,900,000,000		4,600,000,000	3,900,000,000	3,900,000,000
Public Bonds and Private Placement | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of fixed-rate long-term debt											3,800,000,000												3,800,000,000			3,800,000,000
Retail Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long term debt			773,100,000								798,300,000				820,900,000								798,300,000		773,100,000	798,300,000	820,900,000
Unamortized debt premium			49,800,000								82,500,000				97,100,000								82,500,000		49,800,000	82,500,000	97,100,000
Retail Bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of fixed-rate long-term debt			$ 825,000,000								$ 859,800,000				$ 902,400,000								$ 859,800,000		825,000,000	$ 859,800,000	$ 902,400,000
Tysabri®
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of royalty revenues generated by specific agreement																													12.00%
Minimum | Tysabri®
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of royalty revenues generated by specific agreement																											18.00%
Net sales																									$ 2,000,000,000
Maximum | Tysabri®
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of royalty revenues generated by specific agreement																									25.00%
Net sales																									$ 2,000,001,000
Goodwill | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate																									7.00%
Long-term growth rates																									2.00%
Goodwill | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate																									14.50%
Long-term growth rates																									3.00%

[1] ncludes intangible asset impairment charges of $378.6 million, goodwill impairment charges of $224.1 million, and a reduction in held-for-sale impairment charges of $4.5 million. September 26, 2015 (2) December 31, 2015 (3)Six Months Ended December 31, 2015Restated RestatedNet sales$1,273.1 $1,359.1Gross profit$535.2 $543.7Tysabri® royalty stream - change in fair value$(173.8) $116.6Net income (loss)$260.9 $(218.4)Income (loss) per share(1): Basic$1.78 $(1.51)Diluted$1.78 $(1.51)Weighted-average shares outstanding Basic146.3 144.9Diluted146.9 144.9

[2] Includes intangible asset impairment charges of $866.6 million, goodwill impairment charges of $737.9 million, and held-for-sale impairment charges of $10.2 million.

[3] Includes held-for-sale impairment charges of $10.5 million and change in fair market value on royalty rights of $910.8 million.

[4] Includes an intangible asset impairment charges of $273.3 million, and a goodwill impairment charge of $130.5 million.

[5] Includes an intangible asset impairment charge of $185.1 million, Mylan defense-related fees of $71.3 million, an impairment charge on our India API held for sale assets of $29.0 million, restructuring charges of $24.7 million, and an investment impairment charge of $10.7 million.

[6] Includes Mylan defense-related fees of $15.6 million.

[7] (4) Includes acquisition costs of $18.5 million, an initial payment made in connection with an R&D agreement of $18.0 million, an inventory step up related to the Omega acquisition totaling $15.6 million, and $13.4 million of Mylan defense-related fees.

[8] Includes losses on derivatives associated with the Omega acquisition of $258.2 million and Omega financing fees of $18.6 million.

[9] Includes losses on derivatives associated with the Omega acquisition of $64.7 million, Omega transaction expenses of $17.8 million, an R&D payment made in connection with a collaborative agreement of $10.0 million, a $9.6 million loss on extinguishment of debt, partially offset by income from transfer of rights agreement of $12.5 million.