Guarantor Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	$ 2,807.5	$ 2,737.1
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	0.0	0.0
Proceeds from sale of Oncology franchise	2,412.2	0.0
Purchases of PP&E	(564.6)	(565.5)
Acquisition of business, net of cash acquired	(104.7)	0.0
Proceeds/(payments) from sale of investments	31.8	48.1
Other, net	(97.9)	34.8
Net cash provided by/(used in) investing activities	1,676.8	(482.6)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	3,735.3	3,261.6
Repayment of revolving line of credit, long term and short term borrowings	(7,969.0)	(5,664.5)
Proceeds from/(to) intercompany borrowings	0.0	0.0
Payment of contingent consideration	(396.0)	0.0
Payment of dividend	(276.6)	(234.7)
Proceeds from issuance of stock for share-based compensation arrangements	180.8	92.2
Other, net	(25.6)	(26.2)
Net cash used in financing activities	(4,751.1)	(2,571.6)
Effect of foreign exchange rate changes on cash and cash equivalents	(11.9)	6.2
Net decrease in cash, cash equivalents, and restricted cash	(278.7)	(310.9)
Cash, cash equivalents, and restricted cash at beginning of period	511.8	554.5
Cash, cash equivalents, and restricted cash at end of period	233.1	243.6
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	59,694.2	6,470.6
Proceeds from sale of Oncology franchise	0.0
Purchases of PP&E	0.0	0.0
Acquisition of business, net of cash acquired	0.0
Proceeds/(payments) from sale of investments	0.0	0.0
Other, net	0.0	0.0
Net cash provided by/(used in) investing activities	59,694.2	6,470.6
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	(59,694.2)	(6,470.6)
Payment of contingent consideration	0.0
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	(59,694.2)	(6,470.6)
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
Shire plc (Parent Guarantor)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	(251.2)	(102.9)
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(228.0)	(1,339.3)
Proceeds from sale of Oncology franchise	0.0
Purchases of PP&E	0.0	0.0
Acquisition of business, net of cash acquired	0.0
Proceeds/(payments) from sale of investments	0.0	0.0
Other, net	0.0	0.0
Net cash provided by/(used in) investing activities	(228.0)	(1,339.3)
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	(2,560.0)
Proceeds from/(to) intercompany borrowings	923.5	1,919.6
Payment of contingent consideration	(396.0)
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	479.2	1,442.2
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	(17.4)	(62.9)
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(16,010.0)	(262.9)
Proceeds from sale of Oncology franchise	0.0
Purchases of PP&E	0.0	0.0
Acquisition of business, net of cash acquired	0.0
Proceeds/(payments) from sale of investments	0.0	0.0
Other, net	0.0	0.0
Net cash provided by/(used in) investing activities	(16,010.0)	(262.9)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	2,685.0	1,150.0
Repayment of revolving line of credit, long term and short term borrowings	(3,780.0)	(3,100.0)
Proceeds from/(to) intercompany borrowings	17,122.4	2,275.8
Payment of contingent consideration	0.0
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	16,027.4	325.8
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	264.2	0.6
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(11,268.3)	(659.3)
Proceeds from sale of Oncology franchise	0.0
Purchases of PP&E	0.0	0.0
Acquisition of business, net of cash acquired	0.0
Proceeds/(payments) from sale of investments	0.0	(9.8)
Other, net	0.0	0.0
Net cash provided by/(used in) investing activities	(11,268.3)	(669.1)
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	(3,129.5)	0.0
Proceeds from/(to) intercompany borrowings	14,142.0	623.9
Payment of contingent consideration	0.0
Payment of dividend	0.0	0.0
Proceeds from issuance of stock for share-based compensation arrangements	9.1	4.6
Other, net	(18.0)	(0.8)
Net cash used in financing activities	11,003.6	627.7
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)	(40.8)
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	0.9
Non-Guarantor Non-Issuer Subsidiaries
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	2,811.9	2,902.3
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(32,187.9)	(4,209.1)
Proceeds from sale of Oncology franchise	2,412.2
Purchases of PP&E	(564.6)	(565.5)
Acquisition of business, net of cash acquired	(104.7)
Proceeds/(payments) from sale of investments	31.8	57.9
Other, net	(97.9)	34.8
Net cash provided by/(used in) investing activities	(30,511.1)	(4,681.9)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	1,050.3	1.6
Repayment of revolving line of credit, long term and short term borrowings	(1,059.5)	(4.5)
Proceeds from/(to) intercompany borrowings	27,506.3	1,651.3
Payment of contingent consideration	0.0
Payment of dividend	(228.0)	(207.1)
Proceeds from issuance of stock for share-based compensation arrangements	171.4	87.4
Other, net	(7.6)	(25.4)
Net cash used in financing activities	27,432.9	1,503.3
Effect of foreign exchange rate changes on cash and cash equivalents	(11.9)	6.2
Net decrease in cash, cash equivalents, and restricted cash	(278.2)	(270.1)
Cash, cash equivalents, and restricted cash at beginning of period	511.3	512.8
Cash, cash equivalents, and restricted cash at end of period	233.1	242.7
Non-Guarantor Subsidiaries of Baxalta Notes
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by/(used in) operating activities	2,794.5	2,839.4
CASH FLOWS FROM INVESTING ACTIVITIES:
Transactions with subsidiaries	(48,197.9)	(4,472.0)
Proceeds from sale of Oncology franchise	2,412.2
Purchases of PP&E	(564.6)	(565.5)
Acquisition of business, net of cash acquired	(104.7)
Proceeds/(payments) from sale of investments	31.8	57.9
Other, net	(97.9)	34.8
Net cash provided by/(used in) investing activities	(46,521.1)	(4,944.8)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit, long term and short term borrowings	3,735.3	1,151.6
Repayment of revolving line of credit, long term and short term borrowings	(4,839.5)	(3,104.5)
Proceeds from/(to) intercompany borrowings	44,628.7	3,927.1
Payment of contingent consideration	0.0
Payment of dividend	(228.0)	(207.1)
Proceeds from issuance of stock for share-based compensation arrangements	171.4	87.4
Other, net	(7.6)	(25.4)
Net cash used in financing activities	43,460.3	1,829.1
Effect of foreign exchange rate changes on cash and cash equivalents	(11.9)	6.2
Net decrease in cash, cash equivalents, and restricted cash	(278.2)	(270.1)
Cash, cash equivalents, and restricted cash at beginning of period	511.3	512.8
Cash, cash equivalents, and restricted cash at end of period	$ 233.1	$ 242.7

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