Guarantor Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	$ 1,949.9	$ 1,681.9
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	0.0	0.0
Purchases of PP&E	(361.3)	(391.1)
Other, net	(35.6)	43.8
Net cash used in investing activities	(396.9)	(347.3)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	2,650.3	2,111.9
Repayment of revolving line of credit, long term and short term borrowings	(4,262.3)	(3,527.9)
Proceeds from/(to) intercompany borrowings	0.0	0.0
Payment of dividend	(276.6)	(234.7)
Proceeds from issuance of stock for share-based compensation arrangements	133.7	79.5
Other, net	(6.9)	(24.0)
Net cash used in financing activities	(1,761.8)	(1,595.2)
Effect of foreign exchange rate changes on cash and cash equivalents	(8.3)	4.1
Net decrease in cash, cash equivalents, and restricted cash	(217.1)	(256.5)
Cash, cash equivalents, and restricted cash at beginning of period	511.8	554.4
Cash, cash equivalents, and restricted cash at end of period	294.7	297.9
Eliminations
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	0.0	0.0
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	18,639.3	3,032.1
Purchases of PP&E	0.0	0.0
Other, net	0.0	0.0
Net cash used in investing activities	18,639.3	3,032.1
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/(to) intercompany borrowings	(18,639.3)	(3,032.1)
Payment of dividend	0.0	0.0
Proceeds from issuance of stock for share-based compensation arrangements	0.0	0.0
Other, net	0.0	0.0
Net cash used in financing activities	(18,639.3)	(3,032.1)
Effect of foreign exchange rate changes on cash and cash equivalents	0.0	0.0
Net decrease in cash, cash equivalents, and restricted cash	0.0	0.0
Cash, cash equivalents, and restricted cash at beginning of period	0.0	0.0
Cash, cash equivalents, and restricted cash at end of period	0.0	0.0
Shire plc (Parent Guarantor)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	(4.5)	(36.0)
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(103.8)	(760.6)
Purchases of PP&E	0.0	0.0
Other, net	0.0	0.0
Net cash used in investing activities	(103.8)	(760.6)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	0.0	2,110.0
Repayment of revolving line of credit, long term and short term borrowings	0.0	(1,825.0)
Proceeds from/(to) intercompany borrowings	156.6	539.0
Payment of dividend	(48.6)	(27.6)
Proceeds from issuance of stock for share-based compensation arrangements	0.3	0.2
Other, net	0.0	0.0
Net cash used in financing activities	108.3	796.6
Effect of foreign exchange rate changes on cash and cash equivalents	0.0	0.0
Net decrease in cash, cash equivalents, and restricted cash	0.0	0.0
Cash, cash equivalents, and restricted cash at beginning of period	0.0	0.0
Cash, cash equivalents, and restricted cash at end of period	0.0	0.0
SAIIDAC (SAIIDAC Notes Subsidiary Issuer)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	10.2	4.5
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(7,036.8)	0.0
Purchases of PP&E	0.0	0.0
Other, net	0.0	0.0
Net cash used in investing activities	(7,036.8)	0.0
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	1,770.0	0.0
Repayment of revolving line of credit, long term and short term borrowings	(2,625.0)	(1,700.0)
Proceeds from/(to) intercompany borrowings	7,881.6	1,695.5
Payment of dividend	0.0	0.0
Proceeds from issuance of stock for share-based compensation arrangements	0.0	0.0
Other, net	0.0	0.0
Net cash used in financing activities	7,026.6	(4.5)
Effect of foreign exchange rate changes on cash and cash equivalents	0.0	0.0
Net decrease in cash, cash equivalents, and restricted cash	0.0	0.0
Cash, cash equivalents, and restricted cash at beginning of period	0.0	0.0
Cash, cash equivalents, and restricted cash at end of period	0.0	0.0
Baxalta Inc. (Baxalta Notes Subsidiary Issuer and SAIIDAC Notes Subsidiary Guarantor)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	(14.5)	(1.8)
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(1,351.4)	(343.5)
Purchases of PP&E	1.8	0.0
Other, net	0.0	(2.0)
Net cash used in investing activities	(1,349.6)	(345.5)
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	(749.5)	0.0
Proceeds from/(to) intercompany borrowings	2,109.1	303.7
Payment of dividend	0.0	0.0
Proceeds from issuance of stock for share-based compensation arrangements	4.0	4.6
Other, net	0.0	(0.8)
Net cash used in financing activities	1,363.6	307.5
Effect of foreign exchange rate changes on cash and cash equivalents	0.0	0.0
Net decrease in cash, cash equivalents, and restricted cash	(0.5)	(39.8)
Cash, cash equivalents, and restricted cash at beginning of period	0.5	41.7
Cash, cash equivalents, and restricted cash at end of period	0.0	1.9
Non-Guarantor Non-Issuer Subsidiaries
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	1,958.7	1,715.2
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(10,147.3)	(1,928.0)
Purchases of PP&E	(363.1)	(391.1)
Other, net	(35.6)	45.8
Net cash used in investing activities	(10,546.0)	(2,273.3)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	880.3	1.9
Repayment of revolving line of credit, long term and short term borrowings	(887.8)	(2.9)
Proceeds from/(to) intercompany borrowings	8,492.0	493.9
Payment of dividend	(228.0)	(207.1)
Proceeds from issuance of stock for share-based compensation arrangements	129.4	74.7
Other, net	(6.9)	(23.2)
Net cash used in financing activities	8,379.0	337.3
Effect of foreign exchange rate changes on cash and cash equivalents	(8.3)	4.1
Net decrease in cash, cash equivalents, and restricted cash	(216.6)	(216.7)
Cash, cash equivalents, and restricted cash at beginning of period	511.3	512.7
Cash, cash equivalents, and restricted cash at end of period	294.7	296.0
Non-Guarantor Subsidiaries of Baxalta Notes
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	1,968.9	1,719.7
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(17,184.1)	(1,928.0)
Purchases of PP&E	(363.1)	(391.1)
Other, net	(35.6)	45.8
Net cash used in investing activities	(17,582.8)	(2,273.3)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	2,650.3	1.9
Repayment of revolving line of credit, long term and short term borrowings	(3,512.8)	(1,702.9)
Proceeds from/(to) intercompany borrowings	16,373.6	2,189.4
Payment of dividend	(228.0)	(207.1)
Proceeds from issuance of stock for share-based compensation arrangements	129.4	74.7
Other, net	(6.9)	(23.2)
Net cash used in financing activities	15,405.6	332.8
Effect of foreign exchange rate changes on cash and cash equivalents	(8.3)	4.1
Net decrease in cash, cash equivalents, and restricted cash	(216.6)	(216.7)
Cash, cash equivalents, and restricted cash at beginning of period	511.3	512.7
Cash, cash equivalents, and restricted cash at end of period	$ 294.7	$ 296.0

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