Earnings (Loss) Per Share And Shareholder's Equity - Earnings Per Share (Details) - USD ($) 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	[3]	Apr. 01, 2017	[4]	Dec. 31, 2016	[5]	Oct. 01, 2016	[6]	Jul. 02, 2016	[7]	Apr. 02, 2016	[8]	Dec. 31, 2015	[9]	Sep. 26, 2015	[10]	Dec. 31, 2015	Dec. 27, 2014	Dec. 31, 2017	Dec. 31, 2016	Jun. 27, 2015
Numerator:
Net income (loss)		$ 73.1		$ 44.5		$ (69.6)		$ 71.6		$ (1,359.1)		$ (1,590.2)		$ (534.3)		$ (529.2)		$ (218.4)		$ 260.9		$ 42.5	$ 180.6	$ 119.6	$ (4,012.8)	$ 136.1
Denominator:
Basic (in shares)		140.8	[11]	141.3	[11]	143.3	[11]	143.4	[11]	143.4	[11]	143.3	[11]	143.2	[11]	143.2	[11]	144.9	[11]	146.3	[11]	145.6	135.1	142.3	143.3	139.3
Dilutive effect of share-based awards	[12]																					0.5		0.3	0.0	0.5
Diluted (in shares)		141.2	[11]	141.7	[11]	143.3	[11]	143.6	[11]	143.4	[11]	143.3	[11]	143.2	[11]	143.2	[11]	144.9	[11]	146.9	[11]	146.1	135.6	142.6	143.3	139.8
Antidilutive share-based awards oustanding																						0.1		0.8	0.0	0.1

[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.

[12] In the period of a net loss, diluted shares equal basic shares.