Guarantor Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided (used in) operating activities	$ 1,506.0	$ 1,575.2
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	0.0	0.0
Movements in restricted cash	68.3	(48.0)
Purchases of businesses, net of cash acquired	(17,476.2)	(5,553.4)
Purchases of PP&E and non-current investments	(402.5)	(67.3)
Proceeds from short-term investments	0.0	67.0
Proceeds from sale of product rights	7.8	14.5
Proceeds from disposal of non-current investments and PP&E	0.6	18.5
Other, net	(9.3)	2.7
Net cash used in investing activities	(17,811.3)	(5,566.0)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	31,742.3	3,650.8
Repayment of revolving line of credit, long term and short term borrowings	(14,632.9)	(2,486.1)
Proceeds from intercompany borrowings	0.0	0.0
Payment of dividend	(130.2)	(110.2)
Debt issuance costs	(171.0)	(3.3)
Proceeds from exercise of options	98.9	0.0
Other, net	(6.5)	3.7
Net cash provided by financing activities	16,900.6	1,054.9
Effect of foreign exchange rate changes on cash and cash equivalents	(2.2)	(1.6)
Net increase (decrease) in cash and cash equivalents	593.1	(2,937.5)
Cash and cash equivalents at beginning of period	135.5	2,982.4
Cash and cash equivalents at end of period	728.6	44.9
Eliminations
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided (used in) operating activities	0.0	0.0
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	23,425.7	6,113.3
Movements in restricted cash	0.0	0.0
Purchases of businesses, net of cash acquired	0.0	0.0
Purchases of PP&E and non-current investments	0.0	0.0
Proceeds from short-term investments		0.0
Proceeds from sale of product rights	0.0	0.0
Proceeds from disposal of non-current investments and PP&E	0.0	0.0
Other, net	0.0	0.0
Net cash used in investing activities	23,425.7	6,113.3
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	0.0	0.0
Repayment of revolving line of credit, long term and short term borrowings	0.0	0.0
Proceeds from intercompany borrowings	(23,425.7)	(6,113.3)
Payment of dividend	0.0	0.0
Debt issuance costs	0.0	0.0
Proceeds from exercise of options	0.0
Other, net	0.0	0.0
Net cash provided by financing activities	(23,425.7)	(6,113.3)
Effect of foreign exchange rate changes on cash and cash equivalents	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0
Cash and cash equivalents at beginning of period	0.0	0.0
Cash and cash equivalents at end of period	0.0	0.0
Shire plc (Parent Guarantor)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided (used in) operating activities	(79.8)	(107.2)
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(2,390.0)	(3,570.0)
Movements in restricted cash	0.0	(1.1)
Purchases of businesses, net of cash acquired	0.0	0.0
Purchases of PP&E and non-current investments	0.0	0.0
Proceeds from short-term investments		0.0
Proceeds from sale of product rights	0.0	0.0
Proceeds from disposal of non-current investments and PP&E	0.0	0.0
Other, net	0.0	0.0
Net cash used in investing activities	(2,390.0)	(3,571.1)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	1,655.0	3,631.1
Repayment of revolving line of credit, long term and short term borrowings	(2,215.8)	(2,486.1)
Proceeds from intercompany borrowings	3,045.3	2,543.3
Payment of dividend	(15.0)	(5.6)
Debt issuance costs	0.0	(3.3)
Proceeds from exercise of options	0.3
Other, net	0.0	(1.1)
Net cash provided by financing activities	2,469.8	3,678.3
Effect of foreign exchange rate changes on cash and cash equivalents	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0
Cash and cash equivalents at beginning of period	0.0	0.0
Cash and cash equivalents at end of period	0.0	0.0
SAIIDAC (Subsidiary Issuer)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided (used in) operating activities	182.3	0.0
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(18,172.0)	0.0
Movements in restricted cash	0.0	0.0
Purchases of businesses, net of cash acquired	0.0	0.0
Purchases of PP&E and non-current investments	0.0	0.0
Proceeds from short-term investments		0.0
Proceeds from sale of product rights	0.0	0.0
Proceeds from disposal of non-current investments and PP&E	0.0	0.0
Other, net	0.0	0.0
Net cash used in investing activities	(18,172.0)	0.0
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	30,079.9	0.0
Repayment of revolving line of credit, long term and short term borrowings	(12,409.2)	0.0
Proceeds from intercompany borrowings	490.0	0.0
Payment of dividend	0.0	0.0
Debt issuance costs	(171.0)	0.0
Proceeds from exercise of options	0.0
Other, net	0.0	0.0
Net cash provided by financing activities	17,989.7	0.0
Effect of foreign exchange rate changes on cash and cash equivalents	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0
Cash and cash equivalents at beginning of period	0.0	0.0
Cash and cash equivalents at end of period	0.0	0.0
Baxalta Inc. (Subsidiary Issuer)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided (used in) operating activities	(51.8)	0.0
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	0.0	0.0
Movements in restricted cash	0.0	0.0
Purchases of businesses, net of cash acquired	0.0	0.0
Purchases of PP&E and non-current investments	(6.0)	0.0
Proceeds from short-term investments		0.0
Proceeds from sale of product rights	0.0	0.0
Proceeds from disposal of non-current investments and PP&E	0.0	0.0
Other, net	0.0	0.0
Net cash used in investing activities	(6.0)	0.0
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	0.0	0.0
Repayment of revolving line of credit, long term and short term borrowings	0.0	0.0
Proceeds from intercompany borrowings	308.4	0.0
Payment of dividend	0.0	0.0
Debt issuance costs	0.0	0.0
Proceeds from exercise of options	87.9
Other, net	(29.9)	0.0
Net cash provided by financing activities	366.4	0.0
Effect of foreign exchange rate changes on cash and cash equivalents	0.0	0.0
Net increase (decrease) in cash and cash equivalents	308.6	0.0
Cash and cash equivalents at beginning of period	0.0	0.0
Cash and cash equivalents at end of period	308.6	0.0
Non-Guarantor Non-Issuer Subsidiaries
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided (used in) operating activities	1,455.3	1,682.4
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(2,863.7)	(2,543.3)
Movements in restricted cash	68.3	(46.9)
Purchases of businesses, net of cash acquired	(17,476.2)	(5,553.4)
Purchases of PP&E and non-current investments	(396.5)	(67.3)
Proceeds from short-term investments		67.0
Proceeds from sale of product rights	7.8	14.5
Proceeds from disposal of non-current investments and PP&E	0.6	18.5
Other, net	(9.3)	2.7
Net cash used in investing activities	(20,669.0)	(8,108.2)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	7.4	19.7
Repayment of revolving line of credit, long term and short term borrowings	(7.9)	0.0
Proceeds from intercompany borrowings	19,582.0	3,570.0
Payment of dividend	(115.2)	(104.6)
Debt issuance costs	0.0	0.0
Proceeds from exercise of options	10.7
Other, net	23.4	4.8
Net cash provided by financing activities	19,500.4	3,489.9
Effect of foreign exchange rate changes on cash and cash equivalents	(2.2)	(1.6)
Net increase (decrease) in cash and cash equivalents	284.5	(2,937.5)
Cash and cash equivalents at beginning of period	135.5	2,982.4
Cash and cash equivalents at end of period	420.0	44.9
Non-Guarantor Subsidiaries of SAIIDAC Notes
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided (used in) operating activities	1,403.5	1,682.4
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(2,863.7)	(2,543.3)
Movements in restricted cash	68.3	(46.9)
Purchases of businesses, net of cash acquired	(17,476.2)	(5,553.4)
Purchases of PP&E and non-current investments	(402.5)	(67.3)
Proceeds from short-term investments		67.0
Proceeds from sale of product rights	7.8	14.5
Proceeds from disposal of non-current investments and PP&E	0.6	18.5
Other, net	(9.3)	2.7
Net cash used in investing activities	(20,675.0)	(8,108.2)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	7.4	19.7
Repayment of revolving line of credit, long term and short term borrowings	(7.9)	0.0
Proceeds from intercompany borrowings	19,890.4	3,570.0
Payment of dividend	(115.2)	(104.6)
Debt issuance costs	0.0	0.0
Proceeds from exercise of options	98.6
Other, net	(6.5)	4.8
Net cash provided by financing activities	19,866.8	3,489.9
Effect of foreign exchange rate changes on cash and cash equivalents	(2.2)	(1.6)
Net increase (decrease) in cash and cash equivalents	593.1	(2,937.5)
Cash and cash equivalents at beginning of period	135.5	2,982.4
Cash and cash equivalents at end of period	728.6	44.9
Non-Guarantor Subsidiaries of Baxalta Notes
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided (used in) operating activities	1,637.6	1,682.4
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(21,035.7)	(2,543.3)
Movements in restricted cash	68.3	(46.9)
Purchases of businesses, net of cash acquired	(17,476.2)	(5,553.4)
Purchases of PP&E and non-current investments	(396.5)	(67.3)
Proceeds from short-term investments		67.0
Proceeds from sale of product rights	7.8	14.5
Proceeds from disposal of non-current investments and PP&E	0.6	18.5
Other, net	(9.3)	2.7
Net cash used in investing activities	(38,841.0)	(8,108.2)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	30,087.3	19.7
Repayment of revolving line of credit, long term and short term borrowings	(12,417.1)	0.0
Proceeds from intercompany borrowings	20,072.0	3,570.0
Payment of dividend	(115.2)	(104.6)
Debt issuance costs	(171.0)	0.0
Proceeds from exercise of options	10.7
Other, net	23.4	4.8
Net cash provided by financing activities	37,490.1	3,489.9
Effect of foreign exchange rate changes on cash and cash equivalents	(2.2)	(1.6)
Net increase (decrease) in cash and cash equivalents	284.5	(2,937.5)
Cash and cash equivalents at beginning of period	135.5	2,982.4
Cash and cash equivalents at end of period	$ 420.0	$ 44.9

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