Guarantor Financial Information (Consolidating Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 263.7	$ 528.8	$ 693.4	$ 135.5
Restricted cash	34.2	25.6
Accounts receivable, net	2,755.2	2,616.5
Inventories	3,325.3	3,562.3
Prepaid expenses and other current assets	778.5	806.3
Intercompany receivables	0.0	0.0
Short term intercompany loan receivable	0.0	0.0
Total current assets	7,156.9	7,539.5
Investments	197.0	191.6
Property, plant and equipment (PP&E), net	6,554.5	6,469.6
Goodwill	19,482.1	17,888.2	12,962.4	4,147.8
Intangible assets, net	33,434.3	34,697.5	40,890.3	9,173.3
Deferred tax asset	132.2	96.7
Long term intercompany loan receivable	0.0	0.0
Other non-current assets	233.9	152.3
Total assets	67,190.9	67,035.4
Current liabilities:
Accounts payable and accrued expenses	3,842.0	4,312.4
Short term borrowings and capital leases	3,204.9	3,068.0
Intercompany payables	0.0	0.0
Short term intercompany loan payable	0.0	0.0
Other current liabilities	389.6	362.9
Total current liabilities	7,436.5	7,743.3
Long term borrowings and capital leases	18,355.1	19,899.8
Deferred tax liability	7,788.0	8,322.7
Long term intercompany loans payable	0.0	0.0
Other non-current liabilities	2,346.2	2,121.6
Total liabilities	35,925.8	38,087.4
Total equity	31,265.1	28,948.0
Total liabilities and equity	67,190.9	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	(5,986.4)	(5,274.9)
Short term intercompany loan receivable	(1,696.9)	(2,594.8)
Total current assets	(7,683.3)	(7,869.7)
Investments	(86,951.2)	(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	(262.5)	(273.0)
Long term intercompany loan receivable	(14,424.2)	(14,911.7)
Other non-current assets	0.0	0.0
Total assets	(109,321.2)	(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	(5,986.4)	(5,274.9)
Short term intercompany loan payable	(1,696.9)	(2,594.8)
Other current liabilities	0.0	0.0
Total current liabilities	(7,683.3)	(7,869.7)
Long term borrowings and capital leases	0.0	0.0
Deferred tax liability	(262.5)	(273.0)
Long term intercompany loans payable	(14,424.2)	(14,911.7)
Other non-current liabilities	0.0	0.0
Total liabilities	(22,370.0)	(23,054.4)
Total equity	(86,951.2)	(82,680.5)
Total liabilities and equity	(109,321.2)	(105,734.9)
Baxalta Inc. (Baxalta Notes Subsidiary Issuer and SAIIDAC Notes Subsidiary Guarantor)
Current assets:
Cash and cash equivalents	1.9	41.7	53.4	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	96.3	97.1
Intercompany receivables	0.0	0.0
Short term intercompany loan receivable	0.0	0.0
Total current assets	98.2	138.8
Investments	36,293.0	34,644.2
Property, plant and equipment (PP&E), net	9.7	27.4
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Deferred tax asset	272.1	273.0
Long term intercompany loan receivable	784.5	480.7
Other non-current assets	36.8	33.8
Total assets	37,494.3	35,597.9
Current liabilities:
Accounts payable and accrued expenses	23.1	20.0
Short term borrowings and capital leases	747.6	0.0
Intercompany payables	314.0	27.8
Short term intercompany loan payable	0.0	0.0
Other current liabilities	70.9	64.6
Total current liabilities	1,155.6	112.4
Long term borrowings and capital leases	4,319.3	5,063.6
Deferred tax liability	0.0	0.0
Long term intercompany loans payable	0.0	0.0
Other non-current liabilities	60.6	61.8
Total liabilities	5,535.5	5,237.8
Total equity	31,958.8	30,360.1
Total liabilities and equity	37,494.3	35,597.9
Non-Guarantor Non-Issuer Subsidiaries
Current assets:
Cash and cash equivalents	261.8	487.1	640.0	135.5
Restricted cash	34.2	25.6
Accounts receivable, net	2,755.2	2,616.5
Inventories	3,325.3	3,562.3
Prepaid expenses and other current assets	680.8	707.4
Intercompany receivables	5,855.6	5,154.4
Short term intercompany loan receivable	0.0	0.0
Total current assets	12,912.9	12,553.3
Investments	12,612.9	12,571.8
Property, plant and equipment (PP&E), net	6,544.8	6,442.2
Goodwill	19,482.1	17,888.2
Intangible assets, net	33,434.3	34,697.5
Deferred tax asset	122.6	96.7
Long term intercompany loan receivable	0.0	0.0
Other non-current assets	193.6	114.6
Total assets	85,303.2	84,364.3
Current liabilities:
Accounts payable and accrued expenses	3,732.8	4,205.4
Short term borrowings and capital leases	25.4	23.2
Intercompany payables	0.0	0.0
Short term intercompany loan payable	1,696.9	2,594.8
Other current liabilities	315.7	298.3
Total current liabilities	5,770.8	7,121.7
Long term borrowings and capital leases	396.1	405.2
Deferred tax liability	8,050.5	8,595.7
Long term intercompany loans payable	14,424.2	14,301.6
Other non-current liabilities	1,715.6	1,654.5
Total liabilities	30,357.2	32,078.7
Total equity	54,946.0	52,285.6
Total liabilities and equity	85,303.2	84,364.3
Non-Guarantor Subsidiaries of Baxalta Notes
Current assets:
Cash and cash equivalents	261.8	487.1	640.0	135.5
Restricted cash	34.2	25.6
Accounts receivable, net	2,755.2	2,616.5
Inventories	3,325.3	3,562.3
Prepaid expenses and other current assets	680.8	707.4
Intercompany receivables	5,986.4	5,274.9
Short term intercompany loan receivable	1,696.9	2,594.8
Total current assets	14,740.6	15,268.6
Investments	12,612.9	12,571.8
Property, plant and equipment (PP&E), net	6,544.8	6,442.2
Goodwill	19,482.1	17,888.2
Intangible assets, net	33,434.3	34,697.5
Deferred tax asset	122.6	96.7
Long term intercompany loan receivable	13,639.7	14,431.0
Other non-current assets	193.6	114.6
Total assets	100,770.6	101,510.6
Current liabilities:
Accounts payable and accrued expenses	3,817.2	4,291.1
Short term borrowings and capital leases	1,722.3	2,618.0
Intercompany payables	0.0	0.0
Short term intercompany loan payable	1,696.9	2,594.8
Other current liabilities	315.7	298.3
Total current liabilities	7,552.1	9,802.2
Long term borrowings and capital leases	14,035.8	14,836.2
Deferred tax liability	8,050.5	8,595.7
Long term intercompany loans payable	14,424.2	14,301.6
Other non-current liabilities	1,715.6	1,654.5
Total liabilities	45,778.2	49,190.2
Total equity	54,992.4	52,320.4
Total liabilities and equity	100,770.6	101,510.6
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	1.4	1.8
Intercompany receivables	0.0	0.0
Short term intercompany loan receivable	0.0	0.0
Total current assets	1.4	1.8
Investments	38,242.3	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	3.5	3.9
Total assets	38,247.2	35,661.8
Current liabilities:
Accounts payable and accrued expenses	1.7	1.3
Short term borrowings and capital leases	735.0	450.0
Intercompany payables	5,672.4	5,247.1
Short term intercompany loan payable	0.0	0.0
Other current liabilities	3.0	0.0
Total current liabilities	6,412.1	5,698.4
Long term borrowings and capital leases	0.0	0.0
Deferred tax liability	0.0	0.0
Long term intercompany loans payable	0.0	610.1
Other non-current liabilities	570.0	405.3
Total liabilities	6,982.1	6,713.8
Total equity	31,265.1	28,948.0
Total liabilities and equity	38,247.2	35,661.8
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	0.0	0.0
Intercompany receivables	130.8	120.5
Short term intercompany loan receivable	1,696.9	2,594.8
Total current assets	1,827.7	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	13,639.7	14,431.0
Other non-current assets	0.0	0.0
Total assets	15,467.4	17,146.3
Current liabilities:
Accounts payable and accrued expenses	84.4	85.7
Short term borrowings and capital leases	1,696.9	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	1,781.3	2,680.5
Long term borrowings and capital leases	13,639.7	14,431.0
Deferred tax liability	0.0	0.0
Long term intercompany loans payable	0.0	0.0
Other non-current liabilities	0.0	0.0
Total liabilities	15,421.0	17,111.5
Total equity	46.4	34.8
Total liabilities and equity	$ 15,467.4	$ 17,146.3