Transition Period Comparative Data (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended																					6 Months Ended		12 Months Ended
	Dec. 31, 2017	[1]	Sep. 30, 2017	[2]	Jul. 01, 2017		Apr. 01, 2017		Dec. 31, 2016	Dec. 31, 2016	[5]	Oct. 01, 2016	[6]	Jul. 02, 2016	[7]	Apr. 02, 2016	[8]	Dec. 31, 2015		Sep. 26, 2015	[10]	Dec. 31, 2015	Dec. 27, 2014	Dec. 31, 2017	Dec. 31, 2016	Jun. 27, 2015
Transition period financial data [Abstract]
Net sales	$ 1,283.0		$ 1,231.3		$ 1,237.9	[3]	$ 1,194.0	[4]		$ 1,331.2		$ 1,261.6		$ 1,340.5		$ 1,347.3		$ 1,359.1	[9]	$ 1,273.1		$ 2,632.2	$ 1,844.7	$ 4,946.2	$ 5,280.6	$ 4,227.1
Cost of sales																						1,553.3	1,170.9	2,966.7	3,228.8	2,582.9
Gross profit	512.7		497.8		504.6	[3]	464.4	[4]		487.7		484.5		546.5		533.1		543.7	[9]	535.2		1,078.9	673.8	1,979.5	2,051.8	1,644.2
Operating expenses
Distribution																						47.9	29.2	87.0	88.3	67.7
Research and development																						88.2	89.8	167.7	184.0	187.8
Selling																						325.9	95.3	598.4	665.0	319.0
Administration																						306.8	165.6	461.1	452.2	385.3
Impairment charges																						215.6	0.0	47.5	2,631.0	6.8
Restructuring							38.7											24.7				26.9	4.2	61.0	31.0	5.1
Total operating expenses																						1,011.3	384.1	1,381.3	4,051.5	971.7
Operating income (loss)																						67.6	289.7	598.2	(1,999.7)	672.5
Change in financial assets	0.7		2.6		38.7	[3]	(17.1)	[4]	$ 1,100.0	1,115.6		377.4		910.8		204.4		116.6	[9]	(173.8)		(57.3)	(46.9)	24.9	2,608.2	(78.5)
Interest expense, net																						89.9	56.7	168.1	216.6	146.0
Other expense (Income), net																						25.2	60.3	(10.1)	22.7	334.2
Loss on extinguishment of debt					135.2																	0.9	9.6	135.2	1.1	10.5
Income (loss) before income taxes																						8.9	210.0	280.1	(4,848.3)	260.3
Income tax expense (benefit)																						(33.6)	29.4	160.5	(835.5)	124.2
Net income (loss)	$ 73.1		$ 44.5		$ (69.6)	[3]	$ 71.6	[4]		$ (1,359.1)		$ (1,590.2)		$ (534.3)		$ (529.2)		$ (218.4)	[9]	$ 260.9		$ 42.5	$ 180.6	$ 119.6	$ (4,012.8)	$ 136.1
Earnings (loss) per share
Basic (in dollars per share)	$ 0.52	[11]	$ 0.31	[11]	$ (0.49)	[3],[11]	$ 0.50	[4],[11]		$ (9.48)	[11]	$ (11.10)	[11]	$ (3.73)	[11]	$ (3.70)	[11]	$ (1.51)	[9],[11]	$ 1.78	[11]	$ 0.29	$ 1.34	$ 0.84	$ (28.01)	$ 0.97
Diluted (in dollars per share)	$ 0.52	[11]	$ 0.31	[11]	$ (0.49)	[3],[11]	$ 0.50	[4],[11]		$ (9.48)	[11]	$ (11.10)	[11]	$ (3.73)	[11]	$ (3.70)	[11]	$ (1.51)	[9],[11]	$ 1.78	[11]	$ 0.29	$ 1.34	$ 0.84	$ (28.01)	$ 0.97
Weighted Average Shares Outstanding [Abstract]
Basic (in shares)	140.8	[11]	141.3	[11]	143.3	[3],[11]	143.4	[4],[11]		143.4	[11]	143.3	[11]	143.2	[11]	143.2	[11]	144.9	[9],[11]	146.3	[11]	145.6	135.1	142.3	143.3	139.3
Diluted (in shares)	141.2	[11]	141.7	[11]	143.3	[3],[11]	143.6	[4],[11]		143.4	[11]	143.3	[11]	143.2	[11]	143.2	[11]	144.9	[9],[11]	146.9	[11]	146.1	135.6	142.6	143.3	139.8
Dividends declared per share																						$ 0.25	$ 0.21	$ 0.64	$ 0.58	$ 0.4600

[1] (5) Includes unusual litigation charge reversal of $0.2 million.Year Ended December 31, 2016FirstQuarter (2) SecondQuarter (3) ThirdQuarter (4) FourthQuarter (5)Net sales$1,347.3 $1,340.5 $1,261.6 $1,331.2Gross profit$533.1 $546.5 $484.5 $487.7Change in financial assets$204.4 $910.8 $377.4 $1,115.6Net loss$(529.2) $(534.3) $(1,590.2) $(1,359.1)Loss per share(1): Basic$(3.70) $(3.73) $(11.10) $(9.48)Diluted$(3.70) $(3.73) $(11.10) $(9.48)Weighted average shares outstanding Basic143.2 143.2 143.3 143.4Diluted143.2 143.2 143.3 143.4

[2] Includes held-for-sale impairment charges of $3.3 million, and fixed asset impairment charges of $4.0 million.

[3] Includes intangible asset impairment charges of $18.5 million, changes in financial assets of $38.7 million, and loss on early debt extinguishment of $135.2 million.

[4] Includes IPR&D impairment charges of $12.2 million, gain on certain divestiture of $21.8 million, and restructuring charges of $38.7 million.

[5] Includes intangible asset impairment charges of $378.6 million, goodwill impairment charge of $224.1 million, and a reduction in held-for-sale impairment charges of $4.5 million.

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

[7] Includes held-for-sale impairment charges of $10.5 million and change in financial assets of $910.8 million.

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

[9] 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.

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

[11] The sum of individual per share amounts may not equal due to rounding.