Condensed Consolidating Financial Statements (Schedule of Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 30, 2016	Jun. 24, 2016
Current Assets:
Cash and cash equivalents	$ 330.2	$ 342.0	$ 521.9
Accounts receivable, net	482.1	431.0
Inventories	339.4	350.7
Prepaid expenses and other current assets	134.0	131.9
Notes receivable	154.0	0.0
Current assets held for sale	0.0	310.9
Intercompany receivables	0.0	0.0
Total current assets	1,439.7	1,566.5
Property, plant and equipment, net	940.7	881.5
Goodwill	3,446.2	3,498.1
Intangible assets, net	8,604.7	9,000.5
Investment in subsidiaries	0.0	0.0
Intercompany loans receivable	0.0	0.0
Other assets	189.9	259.7
Total Assets	14,621.2	15,206.3
Current Liabilities:
Current maturities of long-term debt	519.4	271.2
Accounts payable	113.9	112.1
Accrued payroll and payroll-related costs	92.8	76.1
Accrued interest	54.1	68.7
Income taxes payable	122.0	101.7
Accrued and other current liabilities	460.2	557.1
Current liabilities held for sale	0.0	120.3
Intercompany payables	0.0	0.0
Total current liabilities	1,362.4	1,307.2
Long-term debt	5,338.5	5,880.8
Pension and postretirement benefits	67.7	136.4
Environmental liabilities	73.6	73.0
Deferred income taxes	2,254.4	2,398.1
Other income tax liabilities	67.5	70.4
Intercompany loans payable	0.0	0.0
Other liabilities	361.1	356.1
Total Liabilities	9,525.2	10,222.0
Shareholders' Equity	5,096.0	4,984.3
Total Liabilities and Shareholders' Equity	14,621.2	15,206.3
Mallinckrodt plc
Current Assets:
Cash and cash equivalents	0.9	0.5	0.1
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	0.4	1.0
Notes receivable	0.0	0.0
Current assets held for sale	0.0	0.0
Intercompany receivables	95.7	59.7
Total current assets	97.0	61.2
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	4,846.2	5,534.1
Intercompany loans receivable	805.2	3.5
Other assets	0.0	0.0
Total Assets	5,748.4	5,598.8
Current Liabilities:
Current maturities of long-term debt	0.0	0.0
Accounts payable	0.1	0.1
Accrued payroll and payroll-related costs	0.0	0.0
Accrued interest	0.0	0.0
Income taxes payable	0.0	0.0
Accrued and other current liabilities	0.5	1.9
Current liabilities held for sale	0.0	0.0
Intercompany payables	651.8	612.5
Total current liabilities	652.4	614.5
Long-term debt	0.0	0.0
Pension and postretirement benefits	0.0	0.0
Environmental liabilities	0.0	0.0
Deferred income taxes	0.0	0.0
Other income tax liabilities	0.0	0.0
Intercompany loans payable	0.0	0.0
Other liabilities	0.0	0.0
Total Liabilities	652.4	614.5
Shareholders' Equity	5,096.0	4,984.3
Total Liabilities and Shareholders' Equity	5,748.4	5,598.8
Mallinckrodt International Finance S.A.
Current Assets:
Cash and cash equivalents	149.9	44.5	88.8
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	0.4	0.0
Notes receivable	0.0	0.0
Current assets held for sale	0.0	0.0
Intercompany receivables	19.7	65.1
Total current assets	170.0	109.6
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	21,498.0	20,624.1
Intercompany loans receivable	0.0	0.0
Other assets	0.0	0.0
Total Assets	21,668.0	20,733.7
Current Liabilities:
Current maturities of long-term debt	317.8	19.7
Accounts payable	0.9	0.1
Accrued payroll and payroll-related costs	0.0	0.0
Accrued interest	53.0	53.9
Income taxes payable	0.0	0.0
Accrued and other current liabilities	0.4	7.5
Current liabilities held for sale	0.0	0.0
Intercompany payables	476.3	467.1
Total current liabilities	848.4	548.3
Long-term debt	5,318.6	5,860.6
Pension and postretirement benefits	0.0	0.0
Environmental liabilities	0.0	0.0
Deferred income taxes	0.0	0.0
Other income tax liabilities	0.0	0.0
Intercompany loans payable	5,008.9	3,329.4
Other liabilities	7.5	7.0
Total Liabilities	11,183.4	9,745.3
Shareholders' Equity	10,484.6	10,988.4
Total Liabilities and Shareholders' Equity	21,668.0	20,733.7
Other Subsidiaries
Current Assets:
Cash and cash equivalents	179.4	297.0	433.0
Accounts receivable, net	482.1	431.0
Inventories	339.4	350.7
Prepaid expenses and other current assets	133.2	130.9
Notes receivable	154.0	0.0
Current assets held for sale	0.0	310.9
Intercompany receivables	1,135.7	1,081.3
Total current assets	2,423.8	2,601.8
Property, plant and equipment, net	940.7	881.5
Goodwill	3,446.2	3,498.1
Intangible assets, net	8,604.7	9,000.5
Investment in subsidiaries	10,484.6	10,988.5
Intercompany loans receivable	4,203.7	3,325.9
Other assets	189.9	259.7
Total Assets	30,293.6	30,556.0
Current Liabilities:
Current maturities of long-term debt	201.6	251.5
Accounts payable	112.9	111.9
Accrued payroll and payroll-related costs	92.8	76.1
Accrued interest	1.1	14.8
Income taxes payable	122.0	101.7
Accrued and other current liabilities	459.3	547.7
Current liabilities held for sale	0.0	120.3
Intercompany payables	123.0	126.5
Total current liabilities	1,112.7	1,350.5
Long-term debt	19.9	20.2
Pension and postretirement benefits	67.7	136.4
Environmental liabilities	73.6	73.0
Deferred income taxes	2,254.4	2,398.1
Other income tax liabilities	67.5	70.4
Intercompany loans payable	0.0	0.0
Other liabilities	353.6	349.1
Total Liabilities	3,949.4	4,397.7
Shareholders' Equity	26,344.2	26,158.3
Total Liabilities and Shareholders' Equity	30,293.6	30,556.0
Eliminations
Current Assets:
Cash and cash equivalents	0.0	0.0	$ 0.0
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	0.0	0.0
Notes receivable	0.0	0.0
Current assets held for sale	0.0	0.0
Intercompany receivables	(1,251.1)	(1,206.1)
Total current assets	(1,251.1)	(1,206.1)
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	(36,828.8)	(37,146.7)
Intercompany loans receivable	(5,008.9)	(3,329.4)
Other assets	0.0	0.0
Total Assets	(43,088.8)	(41,682.2)
Current Liabilities:
Current maturities of long-term debt	0.0	0.0
Accounts payable	0.0	0.0
Accrued payroll and payroll-related costs	0.0	0.0
Accrued interest	0.0	0.0
Income taxes payable	0.0	0.0
Accrued and other current liabilities	0.0	0.0
Current liabilities held for sale	0.0	0.0
Intercompany payables	(1,251.1)	(1,206.1)
Total current liabilities	(1,251.1)	(1,206.1)
Long-term debt	0.0	0.0
Pension and postretirement benefits	0.0	0.0
Environmental liabilities	0.0	0.0
Deferred income taxes	0.0	0.0
Other income tax liabilities	0.0	0.0
Intercompany loans payable	(5,008.9)	(3,329.4)
Other liabilities	0.0	0.0
Total Liabilities	(6,260.0)	(4,535.5)
Shareholders' Equity	(36,828.8)	(37,146.7)
Total Liabilities and Shareholders' Equity	(43,088.8)	(41,682.2)
Ordinary A
Condensed Consolidating Financial Statements
Ordinary A shares	$ 0.0	$ 0.0