Guarantor Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 728.6	$ 135.5	$ 44.9	$ 2,982.4
Restricted cash	20.1	86.0
Accounts receivable, net	2,633.4	1,201.2
Inventories	4,857.1	635.4
Prepaid expenses and other current assets	665.3	197.4
Intercompany receivables	0.0	0.0
Short term intercompany loan receivable	0.0
Total current assets	8,904.5	2,255.5
Non-current assets:
Investments	191.8	50.8
Property, plant and equipment, net	6,527.7	828.1
Goodwill	14,850.6	4,147.8	4,289.6	2,474.9
Intangible assets, net	38,871.5	9,173.3	9,450.6	4,934.4
Long term intercompany loan receivable	0.0
Other non-current assets	405.2	154.3
Total assets	69,751.3	16,609.8
Current liabilities:
Accounts payable and accrued expenses	4,021.7	2,050.6
Short-term borrowings	2,737.1	1,511.5
Intercompany payables	0.0	0.0
Short term intercompany loan payable	0.0
Other current liabilities	352.1	144.0
Total current liabilities	7,110.9	3,706.1
Non-current liabilities:
Long-term borrowings	20,988.9	69.9
Deferred tax liability	9,326.5	2,205.9
Long term intercompany loan payable	0.0
Other non-current liabilities	2,539.3	798.8
Total liabilities	39,965.6	6,780.7
Equity:
Total equity	29,785.7	9,829.1
Total liabilities and equity	69,751.3	16,609.8
Eliminations
Current assets:
Cash and cash equivalents	0.0	0.0	0.0	0.0
Restricted cash	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
Intercompany receivables	(4,225.1)	(3,164.9)
Short term intercompany loan receivable	(1,796.3)
Total current assets	(6,021.4)	(3,164.9)
Non-current assets:
Investments	(84,559.9)	(14,477.2)
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Long term intercompany loan receivable	(15,825.3)
Other non-current assets	(217.0)	0.0
Total assets	(106,623.6)	(17,642.1)
Current liabilities:
Accounts payable and accrued expenses	0.0	0.0
Short-term borrowings	0.0	0.0
Intercompany payables	(4,225.1)	(3,164.9)
Short term intercompany loan payable	(1,796.3)
Other current liabilities		0.0
Total current liabilities	(6,021.4)	(3,164.9)
Non-current liabilities:
Long-term borrowings	0.0	0.0
Deferred tax liability	(217.0)	0.0
Long term intercompany loan payable	(15,825.3)
Other non-current liabilities	0.0	0.0
Total liabilities	(22,063.7)	(3,164.9)
Equity:
Total equity	(84,559.9)	(14,477.2)
Total liabilities and equity	(106,623.6)	(17,642.1)
Shire plc (Parent Guarantor)
Current assets:
Cash and cash equivalents	0.0	0.0	0.0	0.0
Restricted cash	0.0	0.0
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	1.8	1.9
Intercompany receivables	0.0	0.0
Short term intercompany loan receivable	0.0
Total current assets	1.8	1.9
Non-current assets:
Investments	36,448.3	14,477.2
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Long term intercompany loan receivable	0.0
Other non-current assets	4.2	5.3
Total assets	36,454.3	14,484.4
Current liabilities:
Accounts payable and accrued expenses	4.7	10.0
Short-term borrowings	920.0	1,500.0
Intercompany payables	4,225.1	3,145.3
Short term intercompany loan payable	0.0
Other current liabilities	0.0	0.0
Total current liabilities	5,149.8	4,655.3
Non-current liabilities:
Long-term borrowings	0.0	0.0
Deferred tax liability	0.0	0.0
Long term intercompany loan payable	1,110.3
Other non-current liabilities	408.5	0.0
Total liabilities	6,668.6	4,655.3
Equity:
Total equity	29,785.7	9,829.1
Total liabilities and equity	36,454.3	14,484.4
SAIIDAC (Subsidiary Issuer)
Current assets:
Cash and cash equivalents	0.0	0.0	0.0	0.0
Restricted cash	0.0	0.0
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	0.7	9.6
Intercompany receivables	50.2	0.0
Short term intercompany loan receivable	1,796.3
Total current assets	1,847.2	9.6
Non-current assets:
Investments	0.0	0.0
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Long term intercompany loan receivable	15,825.3
Other non-current assets	0.0	8.3
Total assets	17,672.5	17.9
Current liabilities:
Accounts payable and accrued expenses	18.4	0.0
Short-term borrowings	1,796.3	0.0
Intercompany payables	0.0	19.6
Short term intercompany loan payable	0.0
Other current liabilities	1.1	0.0
Total current liabilities	1,815.8	19.6
Non-current liabilities:
Long-term borrowings	15,825.3	0.0
Deferred tax liability	0.0	0.0
Long term intercompany loan payable	0.0
Other non-current liabilities	2.0	0.0
Total liabilities	17,643.1	19.6
Equity:
Total equity	29.4	(1.7)
Total liabilities and equity	17,672.5	17.9
Baxalta Inc. (Subsidiary Issuer)
Current assets:
Cash and cash equivalents	308.6	0.0	0.0	0.0
Restricted cash	0.0	0.0
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	12.7	0.0
Intercompany receivables	432.6	0.0
Short term intercompany loan receivable	0.0
Total current assets	753.9	0.0
Non-current assets:
Investments	35,740.2	0.0
Property, plant and equipment, net	25.9	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Long term intercompany loan receivable	0.0
Other non-current assets	437.3	0.0
Total assets	36,957.3	0.0
Current liabilities:
Accounts payable and accrued expenses	101.5	0.0
Short-term borrowings	0.0	0.0
Intercompany payables	0.0	0.0
Short term intercompany loan payable	0.0
Other current liabilities	48.4	0.0
Total current liabilities	149.9	0.0
Non-current liabilities:
Long-term borrowings	5,104.8	0.0
Deferred tax liability	0.0	0.0
Long term intercompany loan payable	0.0
Other non-current liabilities	64.0	0.0
Total liabilities	5,318.7	0.0
Equity:
Total equity	31,638.6	0.0
Total liabilities and equity	36,957.3	0.0
Non-Guarantor Non-Issuer Subsidiaries
Current assets:
Cash and cash equivalents	420.0	135.5	44.9	2,982.4
Restricted cash	20.1	86.0
Accounts receivable, net	2,633.4	1,201.2
Inventories	4,857.1	635.4
Prepaid expenses and other current assets	650.1	185.9
Intercompany receivables	3,742.3	3,164.9
Short term intercompany loan receivable	0.0
Total current assets	12,323.0	5,408.9
Non-current assets:
Investments	12,563.2	50.8
Property, plant and equipment, net	6,501.8	828.1
Goodwill	14,850.6	4,147.8
Intangible assets, net	38,871.5	9,173.3
Long term intercompany loan receivable	0.0
Other non-current assets	180.7	140.7
Total assets	85,290.8	19,749.6
Current liabilities:
Accounts payable and accrued expenses	3,897.1	2,040.6
Short-term borrowings	20.8	11.5
Intercompany payables	0.0	0.0
Short term intercompany loan payable	1,796.3
Other current liabilities	302.6	144.0
Total current liabilities	6,016.8	2,196.1
Non-current liabilities:
Long-term borrowings	58.8	69.9
Deferred tax liability	9,543.5	2,205.9
Long term intercompany loan payable	14,715.0
Other non-current liabilities	2,064.8	798.8
Total liabilities	32,398.9	5,270.7
Equity:
Total equity	52,891.9	14,478.9
Total liabilities and equity	85,290.8	19,749.6
Non-Guarantor Subsidiaries of SAIIDAC Notes
Current assets:
Cash and cash equivalents	728.6	135.5	44.9	2,982.4
Restricted cash	20.1	86.0
Accounts receivable, net	2,633.4	1,201.2
Inventories	4,857.1	635.4
Prepaid expenses and other current assets	662.8	185.9
Intercompany receivables	4,174.9	3,164.9
Short term intercompany loan receivable	0.0
Total current assets	13,076.9	5,408.9
Non-current assets:
Investments	48,303.4	50.8
Property, plant and equipment, net	6,527.7	828.1
Goodwill	14,850.6	4,147.8
Intangible assets, net	38,871.5	9,173.3
Long term intercompany loan receivable	0.0
Other non-current assets	618.0	140.7
Total assets	122,248.1	19,749.6
Current liabilities:
Accounts payable and accrued expenses	3,998.6	2,040.6
Short-term borrowings	20.8	11.5
Intercompany payables	0.0	0.0
Short term intercompany loan payable	1,796.3
Other current liabilities	351.0	144.0
Total current liabilities	6,166.7	2,196.1
Non-current liabilities:
Long-term borrowings	5,163.6	69.9
Deferred tax liability	9,543.5	2,205.9
Long term intercompany loan payable	14,715.0
Other non-current liabilities	2,128.8	798.8
Total liabilities	37,717.6	5,270.7
Equity:
Total equity	84,530.5	14,478.9
Total liabilities and equity	122,248.1	19,749.6
Non-Guarantor Subsidiaries of Baxalta Notes
Current assets:
Cash and cash equivalents	420.0	135.5	$ 44.9	$ 2,982.4
Restricted cash	20.1	86.0
Accounts receivable, net	2,633.4	1,201.2
Inventories	4,857.1	635.4
Prepaid expenses and other current assets	650.8	195.5
Intercompany receivables	3,792.5	3,164.9
Short term intercompany loan receivable	1,796.3
Total current assets	14,170.2	5,418.5
Non-current assets:
Investments	12,563.2	50.8
Property, plant and equipment, net	6,501.8	828.1
Goodwill	14,850.6	4,147.8
Intangible assets, net	38,871.5	9,173.3
Long term intercompany loan receivable	15,825.3
Other non-current assets	180.7	149.0
Total assets	102,963.3	19,767.5
Current liabilities:
Accounts payable and accrued expenses	3,915.5	2,040.6
Short-term borrowings	1,817.1	11.5
Intercompany payables	0.0	19.6
Short term intercompany loan payable	1,796.3
Other current liabilities	303.7	144.0
Total current liabilities	7,832.6	2,215.7
Non-current liabilities:
Long-term borrowings	15,884.1	69.9
Deferred tax liability	9,543.5	2,205.9
Long term intercompany loan payable	14,715.0
Other non-current liabilities	2,066.8	798.8
Total liabilities	50,042.0	5,290.3
Equity:
Total equity	52,921.3	14,477.2
Total liabilities and equity	$ 102,963.3	$ 19,767.5