Guarantor Financial Information (Consolidating Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 209.3	$ 528.8	$ 728.6	$ 135.5
Restricted cash	34.3	25.6
Accounts receivable, net	2,840.7	2,616.5
Inventories	3,427.3	3,562.3
Prepaid expenses and other current assets	779.9	806.3
Intercompany receivables	0.0	0.0
Short term intercompany loan receivable	0.0	0.0
Total current assets	7,291.5	7,539.5
Investments	199.7	191.6
Property, plant and equipment (PP&E), net	6,579.5	6,469.6
Goodwill	19,718.4	17,888.2	14,850.6	4,147.8
Intangible assets, net	33,350.3	34,697.5	38,871.5	9,173.3
Deferred tax asset	94.6	96.7
Long term intercompany loan receivable	0.0	0.0
Other non-current assets	242.5	152.3
Total assets	67,476.5	67,035.4
Current liabilities:
Accounts payable and accrued expenses	3,870.5	4,312.4
Short term borrowings and capital leases	2,629.2	3,068.0
Intercompany payables	0.0	0.0
Short term intercompany loan payable	0.0	0.0
Other current liabilities	961.4	362.9
Total current liabilities	7,461.1	7,743.3
Long term borrowings and capital leases	17,956.0	19,899.8
Deferred tax liability	7,681.7	8,322.7
Long term intercompany loan payable	0.0	0.0
Other non-current liabilities	1,723.1	2,121.6
Total liabilities	34,821.9	38,087.4
Total equity	32,654.6	28,948.0
Total liabilities and equity	67,476.5	67,035.4
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	(4,366.0)	(5,274.9)
Short term intercompany loan receivable	(1,849.6)	(2,594.8)
Total current assets	(6,215.6)	(7,869.7)
Investments	(88,941.8)	(82,680.5)
Property, plant and equipment (PP&E), net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Deferred tax asset	(294.6)	(273.0)
Long term intercompany loan receivable	(14,466.8)	(14,911.7)
Other non-current assets	0.0	0.0
Total assets	(109,918.8)	(105,734.9)
Current liabilities:
Accounts payable and accrued expenses	0.0	0.0
Short term borrowings and capital leases	0.0	0.0
Intercompany payables	(4,366.0)	(5,274.9)
Short term intercompany loan payable	(1,849.6)	(2,594.8)
Other current liabilities	0.0	0.0
Total current liabilities	(6,215.6)	(7,869.7)
Long term borrowings and capital leases	0.0	0.0
Deferred tax liability	(294.6)	(273.0)
Long term intercompany loan payable	(14,466.8)	(14,911.7)
Other non-current liabilities	0.0	0.0
Total liabilities	(20,977.0)	(23,054.4)
Total equity	(88,941.8)	(82,680.5)
Total liabilities and equity	(109,918.8)	(105,734.9)
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	0.0	1.8
Intercompany receivables	0.0	0.0
Short term intercompany loan receivable	0.0	0.0
Total current assets	0.0	1.8
Investments	39,685.8	35,656.1
Property, plant and equipment (PP&E), net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Deferred tax asset	0.0	0.0
Long term intercompany loan receivable	0.0	0.0
Other non-current assets	0.0	3.9
Total assets	39,685.8	35,661.8
Current liabilities:
Accounts payable and accrued expenses	0.7	1.3
Short term borrowings and capital leases	0.0	450.0
Intercompany payables	3,615.2	5,247.1
Short term intercompany loan payable	0.0	0.0
Other current liabilities	575.5	0.0
Total current liabilities	4,191.4	5,698.4
Long term borrowings and capital leases	0.0	0.0
Deferred tax liability	0.0	0.0
Long term intercompany loan payable	2,839.8	610.1
Other non-current liabilities	0.0	405.3
Total liabilities	7,031.2	6,713.8
Total equity	32,654.6	28,948.0
Total liabilities and equity	39,685.8	35,661.8
Baxalta Inc. (Baxalta Notes Subsidiary Issuer and SAIIDAC Notes Subsidiary Guarantor)
Current assets:
Cash and cash equivalents	0.9	41.7	308.6	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	98.1	97.1
Intercompany receivables	0.0	0.0
Short term intercompany loan receivable	0.0	0.0
Total current assets	99.0	138.8
Investments	36,851.3	34,644.2
Property, plant and equipment (PP&E), net	7.1	27.4
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Deferred tax asset	294.6	273.0
Long term intercompany loan receivable	1,223.5	480.7
Other non-current assets	36.0	33.8
Total assets	38,511.5	35,597.9
Current liabilities:
Accounts payable and accrued expenses	61.0	20.0
Short term borrowings and capital leases	748.2	0.0
Intercompany payables	750.8	27.8
Short term intercompany loan payable	0.0	0.0
Other current liabilities	10.3	64.6
Total current liabilities	1,570.3	112.4
Long term borrowings and capital leases	4,317.0	5,063.6
Deferred tax liability	0.0	0.0
Long term intercompany loan payable	0.0	0.0
Other non-current liabilities	62.4	61.8
Total liabilities	5,949.7	5,237.8
Total equity	32,561.8	30,360.1
Total liabilities and equity	38,511.5	35,597.9
Non-Guarantor Non-Issuer Subsidiaries
Current assets:
Cash and cash equivalents	208.4	487.1	420.0	135.5
Restricted cash	34.3	25.6
Accounts receivable, net	2,840.7	2,616.5
Inventories	3,427.3	3,562.3
Prepaid expenses and other current assets	680.4	707.4
Intercompany receivables	4,313.5	5,154.4
Short term intercompany loan receivable	0.0	0.0
Total current assets	11,504.6	12,553.3
Investments	12,604.4	12,571.8
Property, plant and equipment (PP&E), net	6,572.4	6,442.2
Goodwill	19,718.4	17,888.2
Intangible assets, net	33,350.3	34,697.5
Deferred tax asset	94.6	96.7
Long term intercompany loan receivable	0.0	0.0
Other non-current assets	203.3	114.6
Total assets	84,048.0	84,364.3
Current liabilities:
Accounts payable and accrued expenses	3,801.1	4,205.4
Short term borrowings and capital leases	31.4	23.2
Intercompany payables	0.0	0.0
Short term intercompany loan payable	1,849.6	2,594.8
Other current liabilities	375.6	298.3
Total current liabilities	6,057.7	7,121.7
Long term borrowings and capital leases	395.7	405.2
Deferred tax liability	7,976.3	8,595.7
Long term intercompany loan payable	11,627.0	14,301.6
Other non-current liabilities	1,660.7	1,654.5
Total liabilities	27,717.4	32,078.7
Total equity	56,330.6	52,285.6
Total liabilities and equity	84,048.0	84,364.3
Non-Guarantor Subsidiaries of Baxalta Notes
Current assets:
Cash and cash equivalents	208.4	487.1	420.0	135.5
Restricted cash	34.3	25.6
Accounts receivable, net	2,840.7	2,616.5
Inventories	3,427.3	3,562.3
Prepaid expenses and other current assets	681.8	707.4
Intercompany receivables	4,366.0	5,274.9
Short term intercompany loan receivable	1,849.6	2,594.8
Total current assets	13,408.1	15,268.6
Investments	12,604.4	12,571.8
Property, plant and equipment (PP&E), net	6,572.4	6,442.2
Goodwill	19,718.4	17,888.2
Intangible assets, net	33,350.3	34,697.5
Deferred tax asset	94.6	96.7
Long term intercompany loan receivable	13,243.3	14,431.0
Other non-current assets	206.5	114.6
Total assets	99,198.0	101,510.6
Current liabilities:
Accounts payable and accrued expenses	3,808.8	4,291.1
Short term borrowings and capital leases	1,881.0	2,618.0
Intercompany payables	0.0	0.0
Short term intercompany loan payable	1,849.6	2,594.8
Other current liabilities	375.6	298.3
Total current liabilities	7,915.0	9,802.2
Long term borrowings and capital leases	13,639.0	14,836.2
Deferred tax liability	7,976.3	8,595.7
Long term intercompany loan payable	11,627.0	14,301.6
Other non-current liabilities	1,660.7	1,654.5
Total liabilities	42,818.0	49,190.2
Total equity	56,380.0	52,320.4
Total liabilities and equity	99,198.0	101,510.6
SAIIDAC (SAIIDAC Notes 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	1.4	0.0
Intercompany receivables	52.5	120.5
Short term intercompany loan receivable	1,849.6	2,594.8
Total current assets	1,903.5	2,715.3
Investments	0.0	0.0
Property, plant and equipment (PP&E), net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Deferred tax asset	0.0	0.0
Long term intercompany loan receivable	13,243.3	14,431.0
Other non-current assets	3.2	0.0
Total assets	15,150.0	17,146.3
Current liabilities:
Accounts payable and accrued expenses	7.7	85.7
Short term borrowings and capital leases	1,849.6	2,594.8
Intercompany payables	0.0	0.0
Short term intercompany loan payable	0.0	0.0
Other current liabilities	0.0	0.0
Total current liabilities	1,857.3	2,680.5
Long term borrowings and capital leases	13,243.3	14,431.0
Deferred tax liability	0.0	0.0
Long term intercompany loan payable	0.0	0.0
Other non-current liabilities	0.0	0.0
Total liabilities	15,100.6	17,111.5
Total equity	49.4	34.8
Total liabilities and equity	$ 15,150.0	$ 17,146.3