- Condensed Consolidated Balance Sheet (Details) $ / shares in Units, $ in Thousands	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 € / shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2015 € / shares	Jun. 27, 2015 USD ($) $ / shares shares	Jun. 27, 2015 € / shares	Jun. 28, 2014 USD ($) $ / shares shares	Jun. 28, 2014 € / shares	Jun. 29, 2013 USD ($)
Assets
Cash and cash equivalents	$ 622,300		$ 417,800		$ 785,600		$ 799,500		$ 779,900
Accounts receivable, net of allowance for doubtful accounts of $6.3 million, $4.5 million, and $2.6 million, respectively	1,176,000		1,189,000		1,209,400		931,500
Inventories	795,000		898,700		935,700		629,900
Current deferred income taxes	0		0		148,200		62,800
Prepaid expenses and other current assets	212,000		286,100		150,100		121,900
Total current assets	2,805,300		2,791,600		3,229,000		2,545,600
Property, plant and equipment, net	870,100		886,200		932,400		779,900
Tysabri® royalty stream - at fair value	2,350,000		5,310,000		5,420,000		5,680,000
Goodwill and other indefinite-lived intangible assets	4,163,900		7,069,000		6,984,300		3,542,700
Other intangible assets, net	3,396,800		2,973,100		2,742,800		1,128,700
Non-current deferred income taxes	72,100		71,400		50,100		23,600
Other non-current assets	211,900		248,300		233,300		178,600
Total non-current assets	11,064,800		16,558,000		16,362,900		11,333,500
Total assets	13,870,100		19,349,600		19,591,900		13,879,100
Allowance for doubtful accounts	6,300		4,500		2,600		2,700
Liabilities and Shareholders’ Equity
Accounts payable	471,700		555,800		709,300		364,300
Payroll and related taxes	115,800		125,300		133,900		112,300
Accrued customer programs	380,300		396,000		358,500		256,500
Accrued liabilities	263,300		351,900		257,500		174,100
Accrued income taxes	32,400		62,700		56,300		16,800
Current deferred income taxes	0		0		79,700		1,100
Current indebtedness	572,800		1,060,500		153,300		143,700
Total current liabilities	1,836,300		2,552,200		1,748,500		1,068,800
Long-term debt, less current portion	5,224,500		4,971,600		5,246,900		3,063,100
Non-current deferred income taxes	389,900		1,372,700		1,514,300		732,600
Other non-current liabilities	461,800		346,300		382,700		293,400
Total non-current liabilities	6,076,200		6,690,600		7,143,900		4,089,100
Total liabilities	(7,912,500)		(9,242,800)		(8,892,400)		(5,157,900)
Commitments and Contingencies
Preferred shares, $0.0001 par value, 10 million shares authorized	0		0		0		0
Ordinary shares, €0.001 par value, 10 billion shares authorized	8,135,000		8,142,600		8,621,900		6,678,200
Accumulated other comprehensive income	(81,800)		(15,300)		103,500		139,600
Retained earnings (accumulated deficit)	(2,095,100)		1,980,100		1,973,900		1,902,600
Total controlling interest	5,958,100		10,107,400		10,699,300		8,720,400		2,331,400
Noncontrolling interest	(500)		(600)		200		800
Total shareholders’ equity	5,957,600		10,106,800		10,699,500		8,721,200
Total liabilities and shareholders' equity	$ 13,870,100		$ 19,349,600		$ 19,591,900		$ 13,879,100
Preferred shares, par value (in dollars per share) | $ / shares	$ 0.0001		$ 0.0001		$ 0.0001		$ 0.0001
Preferred shares, authorized (in shares) | shares	10,000,000		10,000,000		10,000,000		10,000,000
Ordinary shares, par value (in dollars per share) | € / shares		€ 0.001		€ 0.001		€ 0.001		€ 0.001
Ordinary shares, authorized (in shares) | shares	10,000,000,000		10,000,000,000		10,000,000,000		10,000,000,000
Previously Reported
Assets
Cash and cash equivalents			$ 417,800		$ 785,600		$ 799,500		779,900
Accounts receivable, net of allowance for doubtful accounts of $6.3 million, $4.5 million, and $2.6 million, respectively			1,193,100		1,282,100		935,100
Inventories			844,400		838,900		631,600
Current deferred income taxes					122,300		62,800
Prepaid expenses and other current assets			289,100		154,000		121,900
Total current assets			2,744,400		3,182,900		2,550,900
Property, plant and equipment, net			886,200		932,400		779,900
Tysabri® royalty stream - at fair value			0		0		0
Goodwill and other indefinite-lived intangible assets			7,281,200		7,235,000		3,543,800
Other intangible assets, net			8,190,500		8,105,600		6,787,000
Non-current deferred income taxes			54,600		39,600		23,600
Other non-current assets			237,000		225,100		167,600
Total non-current assets			16,649,500		16,537,700		11,301,900
Total assets			19,393,900		19,720,600		13,852,800
Allowance for doubtful accounts			4,500		2,600		2,700
Liabilities and Shareholders’ Equity
Accounts payable			554,900		747,500		364,300
Payroll and related taxes			125,300		133,900		112,300
Accrued customer programs			398,000		368,100		256,500
Accrued liabilities			308,400		246,400		179,400
Accrued income taxes			85,200		52,600		17,400
Current deferred income taxes					80,600		1,100
Current indebtedness			1,018,300		64,600		143,700
Total current liabilities			2,490,100		1,693,700		1,074,700
Long-term debt, less current portion			4,971,600		5,246,900		3,063,100
Non-current deferred income taxes			1,563,700		1,745,100		727,900
Other non-current liabilities			332,400		372,100		293,400
Total non-current liabilities			6,867,700		7,364,100		4,084,400
Total liabilities			(9,357,800)		(9,057,800)		(5,159,100)
Commitments and Contingencies
Preferred shares, $0.0001 par value, 10 million shares authorized			0		0		0
Ordinary shares, €0.001 par value, 10 billion shares authorized			8,144,600		8,621,900		6,678,200
Accumulated other comprehensive income			(15,500)		102,400		139,600
Retained earnings (accumulated deficit)			1,907,600		1,938,300		1,875,100
Total controlling interest			10,036,700		10,662,600		8,692,900
Noncontrolling interest			(600)		200		800
Total shareholders’ equity			10,036,100		10,662,800		8,693,700
Total liabilities and shareholders' equity			$ 19,393,900		$ 19,720,600		$ 13,852,800
Preferred shares, par value (in dollars per share) | $ / shares			$ 0.0001		$ 0.0001		$ 0.0001
Preferred shares, authorized (in shares) | shares			10,000,000		10,000,000		10,000,000
Ordinary shares, par value (in dollars per share) | € / shares				€ 0.001		€ 0.001		€ 0.001
Ordinary shares, authorized (in shares) | shares			10,000,000,000		10,000,000,000		10,000,000,000
Adjustments | Tysabri®
Assets
Cash and cash equivalents			$ 0		$ 0		$ 0		0
Accounts receivable, net of allowance for doubtful accounts of $6.3 million, $4.5 million, and $2.6 million, respectively			0		0		0
Inventories			0		0		0
Current deferred income taxes					0		0
Prepaid expenses and other current assets			0		0		0
Total current assets			0		0		0
Property, plant and equipment, net			0		0		0
Tysabri® royalty stream - at fair value			5,310,000		5,420,000		5,680,000
Goodwill and other indefinite-lived intangible assets			0		0		0
Other intangible assets, net			(5,212,200)		(5,357,200)		(5,647,300)
Non-current deferred income taxes			0		0		0
Other non-current assets			0		0		0
Total non-current assets			97,800		62,800		32,700
Total assets			97,800		62,800		32,700
Allowance for doubtful accounts			0		0		0
Liabilities and Shareholders’ Equity
Accounts payable			0		0		0
Payroll and related taxes			0		0		0
Accrued customer programs			0		0		0
Accrued liabilities			0		0		0
Accrued income taxes			0		0		0
Current deferred income taxes					0		0
Current indebtedness			0		0		0
Total current liabilities			0		0		0
Long-term debt, less current portion			0		0		0
Non-current deferred income taxes			12,200		7,900		4,100
Other non-current liabilities			0		0		0
Total non-current liabilities			12,200		7,900		4,100
Total liabilities			(12,200)		(7,900)		(4,100)
Preferred shares, $0.0001 par value, 10 million shares authorized			0		0		0
Ordinary shares, €0.001 par value, 10 billion shares authorized			0		0		0
Accumulated other comprehensive income			0		0		0
Retained earnings (accumulated deficit)			85,600		54,900		28,600
Total controlling interest			85,600		54,900		28,600
Noncontrolling interest			0		0		0
Total shareholders’ equity			85,600		54,900		28,600
Total liabilities and shareholders' equity			97,800		62,800		32,700
Adjustments | Other
Assets
Cash and cash equivalents			0		0		0		$ 0
Accounts receivable, net of allowance for doubtful accounts of $6.3 million, $4.5 million, and $2.6 million, respectively			(4,100)		(72,700)		(3,600)
Inventories			54,300		96,800		(1,700)
Current deferred income taxes					25,900		0
Prepaid expenses and other current assets			(3,000)		(3,900)		0
Total current assets			47,200		46,100		(5,300)
Property, plant and equipment, net			0		0		0
Tysabri® royalty stream - at fair value			0		0		0
Goodwill and other indefinite-lived intangible assets			(212,200)		(250,700)		(1,100)
Other intangible assets, net			(5,200)		(5,600)		(11,000)
Non-current deferred income taxes			16,800		10,500		0
Other non-current assets			11,300		8,200		11,000
Total non-current assets			(189,300)		(237,600)		(1,100)
Total assets			(142,100)		(191,500)		(6,400)
Allowance for doubtful accounts			0		0		0
Liabilities and Shareholders’ Equity
Accounts payable			900		(38,200)		0
Payroll and related taxes			0		0		0
Accrued customer programs			(2,000)		(9,600)		0
Accrued liabilities			43,500		11,100		(5,300)
Accrued income taxes			(22,500)		3,700		(600)
Current deferred income taxes					(900)		0
Current indebtedness			42,200		88,700		0
Total current liabilities			62,100		54,800		(5,900)
Long-term debt, less current portion			0		0		0
Non-current deferred income taxes			(203,200)		(238,700)		600
Other non-current liabilities			13,900		10,600		0
Total non-current liabilities			(189,300)		(228,100)		600
Total liabilities			127,200		173,300		5,300
Preferred shares, $0.0001 par value, 10 million shares authorized			0		0		0
Ordinary shares, €0.001 par value, 10 billion shares authorized			(2,000)		0		0
Accumulated other comprehensive income			200		1,100		0
Retained earnings (accumulated deficit)			(13,100)		(19,300)		(1,100)
Total controlling interest			(14,900)		(18,200)		(1,100)
Noncontrolling interest			0		0		0
Total shareholders’ equity			(14,900)		(18,200)		(1,100)
Total liabilities and shareholders' equity			(142,100)		(191,500)		$ (6,400)
Adjustments | BCH Deferred Tax Matters Misstatement
Assets
Goodwill and other indefinite-lived intangible assets			(223,300)
Non-current deferred income taxes			272,200		268,900
Total assets					262,300
Liabilities and Shareholders’ Equity
Non-current deferred income taxes			65,400		4,000
Adjustments | BCH Belgium Distribution Contracts Misstatement
Assets
Accounts receivable, net of allowance for doubtful accounts of $6.3 million, $4.5 million, and $2.6 million, respectively					39,500
Goodwill and other indefinite-lived intangible assets			10,200		10,500
Liabilities and Shareholders’ Equity
Accounts payable					1,000
Non-current deferred income taxes			$ 8,700		$ (8,600)