Condensed Consolidating Financial Statements (Schedule of Condensed Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 25, 2016
Condensed Consolidating Financial Statements
Net sales	$ 810.9	$ 815.8
Cost of sales	392.3	390.7
Gross profit	418.6	425.1
Selling, general and administrative expenses	308.1	209.3
Research and development expenses	62.2	58.1
Restructuring charges, net	17.2	8.4
Non-restructuring impairment charges	0.0
Gains on divestiture and license	(59.1)	0.0
Non-restructuring impairment charges	0.0	16.9
Operating income	90.2	132.4
Interest expense	(94.2)	(97.2)
Interest income	0.9	0.2
Other expense, net	(7.5)	(0.7)
Intercompany Interest And Fees	0.0	0.0
Income (Loss) from Equity Method Investments	0.0	0.0
(Loss) income from continuing operations before income taxes	(10.6)	34.7
Income tax benefit	(39.5)	(63.8)
Income from continuing operations	28.9	98.5
Income from discontinued operations, net of income taxes	370.3	19.8
Net income	399.2	118.3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	62.6	0.2
Comprehensive (loss) income	461.8	118.5
Mallinckrodt plc
Condensed Consolidating Financial Statements
Net sales	0.0	0.0
Cost of sales	0.0	0.0
Gross profit	0.0	0.0
Selling, general and administrative expenses	18.2	13.9
Research and development expenses	0.0	0.0
Restructuring charges, net	0.0	0.0
Non-restructuring impairment charges	0.0
Gains on divestiture and license	0.0
Non-restructuring impairment charges		0.0
Operating income	(18.2)	(13.9)
Interest expense	(3.3)	(69.9)
Interest income	1.1	0.0
Other expense, net	15.4	12.3
Intercompany Interest And Fees	(5.5)	(2.8)
Income (Loss) from Equity Method Investments	408.7	192.5
(Loss) income from continuing operations before income taxes	398.2	118.2
Income tax benefit	(2.0)	(0.1)
Income from continuing operations	400.2	118.3
Income from discontinued operations, net of income taxes	(1.0)	0.0
Net income	399.2	118.3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	62.6	0.2
Comprehensive (loss) income	461.8	118.5
Mallinckrodt International Finance S.A.
Condensed Consolidating Financial Statements
Net sales	0.0	0.0
Cost of sales	0.0	0.0
Gross profit	0.0	0.0
Selling, general and administrative expenses	0.2	0.2
Research and development expenses	0.0	0.0
Restructuring charges, net	0.0	0.0
Non-restructuring impairment charges	0.0
Gains on divestiture and license	0.0
Non-restructuring impairment charges		0.0
Operating income	(0.2)	(0.2)
Interest expense	(85.3)	(81.5)
Interest income	0.3	0.2
Other expense, net	(9.9)	(0.1)
Intercompany Interest And Fees	0.0	0.1
Income (Loss) from Equity Method Investments	597.0	332.0
(Loss) income from continuing operations before income taxes	501.9	250.5
Income tax benefit	(0.3)	(3.8)
Income from continuing operations	502.2	254.3
Income from discontinued operations, net of income taxes	(1.7)	(1.5)
Net income	500.5	252.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	62.6	0.2
Comprehensive (loss) income	563.1	253.0
Other Subsidiaries
Condensed Consolidating Financial Statements
Net sales	810.9	815.8
Cost of sales	392.3	390.7
Gross profit	418.6	425.1
Selling, general and administrative expenses	289.7	195.2
Research and development expenses	62.2	58.1
Restructuring charges, net	17.2	8.4
Non-restructuring impairment charges	0.0
Gains on divestiture and license	(59.1)
Non-restructuring impairment charges		16.9
Operating income	108.6	146.5
Interest expense	(20.2)	(21.7)
Interest income	14.1	75.9
Other expense, net	(13.0)	(12.9)
Intercompany Interest And Fees	5.5	2.7
Income (Loss) from Equity Method Investments	500.5	252.8
(Loss) income from continuing operations before income taxes	595.5	443.3
Income tax benefit	(37.2)	(59.9)
Income from continuing operations	632.7	503.2
Income from discontinued operations, net of income taxes	373.0	21.3
Net income	1,005.7	524.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	125.0	0.2
Comprehensive (loss) income	1,130.7	524.7
Eliminations
Condensed Consolidating Financial Statements
Net sales	0.0	0.0
Cost of sales	0.0	0.0
Gross profit	0.0	0.0
Selling, general and administrative expenses	0.0	0.0
Research and development expenses	0.0	0.0
Restructuring charges, net	0.0	0.0
Non-restructuring impairment charges	0.0
Gains on divestiture and license	0.0
Non-restructuring impairment charges		0.0
Operating income	0.0	0.0
Interest expense	14.6	75.9
Interest income	(14.6)	(75.9)
Other expense, net	0.0	0.0
Intercompany Interest And Fees	0.0	0.0
Income (Loss) from Equity Method Investments	(1,506.2)	(777.3)
(Loss) income from continuing operations before income taxes	(1,506.2)	(777.3)
Income tax benefit	0.0	0.0
Income from continuing operations	(1,506.2)	(777.3)
Income from discontinued operations, net of income taxes	0.0	0.0
Net income	(1,506.2)	(777.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(187.6)	(0.4)
Comprehensive (loss) income	$ (1,693.8)	$ (777.7)