Guarantor Financial Information (Consolidating Statements of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Product sales	$ 3,315.4	$ 1,576.8	$ 7,264.8	$ 4,476.2
Royalties and other revenues	136.7	78.2	325.7	224.8
Total revenues	3,452.1	1,655.0	7,590.5	4,701.0
Costs and expenses:
Cost of sales	1,736.2	262.7	2,762.9	718.5
Research and development	511.1	241.2	1,023.0	1,210.8
Selling, general and administrative	875.6	442.3	2,025.8	1,356.6
Amortization of acquired intangibles	354.9	132.7	702.5	352.3
Integration and acquisition costs	284.5	89.9	738.6	(46.8)
Reorganization costs	101.4	31.1	115.7	59.6
Other operating expenses		(0.7)		(13.0)
Gain on sale of product rights	(5.7)	(0.7)	(12.2)	(13.0)
Total operating expenses	3,858.0	1,199.2	7,356.3	3,638.0
Operating (loss)/income from continuing operations	(405.9)	455.8	234.2	1,063.0
Interest income/(expense), net	(177.6)	(9.9)	(306.9)	(28.2)
Other income, net	(13.7)	9.6	(16.2)	11.9
Total other expense, net	(191.3)	(0.3)	(323.1)	(16.3)
(Loss)/income from continuing operations before income taxes and equity in losses of equity method investees	(597.2)	455.5	(88.9)	1,046.7
Income tax benefit/(expense)	229.6	22.3	218.4	9.0
Equity in income/(losses) of equity method investees, net of taxes	0.9	0.7	1.9	1.6
(Loss)/income from continuing operations, net of taxes	(368.5)	477.1	127.6	1,054.1
Loss from discontinued operations, net of taxes	(18.3)	(24.3)	(257.5)	(31.3)
Net (loss)/income	(386.8)	452.8	(129.9)	1,022.8
Comprehensive (loss)/income	(135.2)	409.2	(80.3)	899.2
Eliminations
Revenues:
Product sales	0.0	0.0	0.0	0.0
Royalties and other revenues	0.0	0.0	0.0	0.0
Total revenues	0.0	0.0	0.0	0.0
Costs and expenses:
Cost of sales	0.0	0.0	0.0	0.0
Research and development	0.0	0.0	0.0	0.0
Selling, general and administrative	0.0	0.0	0.0	0.0
Amortization of acquired intangibles	0.0	0.0	0.0	0.0
Integration and acquisition costs	0.0	0.0	0.0	0.0
Reorganization costs	0.0	0.0	0.0	0.0
Other operating expenses		0.0		0.0
Gain on sale of product rights	0.0		0.0
Total operating expenses	0.0	0.0	0.0	0.0
Operating (loss)/income from continuing operations	0.0	0.0	0.0	0.0
Interest income/(expense), net	0.0	0.0	0.0	0.0
Other income, net	0.0	0.0	0.0	0.0
Total other expense, net	0.0	0.0	0.0	0.0
(Loss)/income from continuing operations before income taxes and equity in losses of equity method investees	0.0	0.0	0.0	0.0
Income tax benefit/(expense)	0.0	0.0	0.0	0.0
Equity in income/(losses) of equity method investees, net of taxes	(871.0)	477.8	(667.5)	1,089.2
(Loss)/income from continuing operations, net of taxes	871.0	(477.8)	667.5	(1,089.2)
Loss from discontinued operations, net of taxes	0.0	0.0	0.0	0.0
Net (loss)/income	871.0	(477.8)	667.5	(1,089.2)
Comprehensive (loss)/income	871.0	(434.2)	1,055.8	(965.6)
Shire plc (Parent Guarantor)
Revenues:
Product sales	0.0	0.0	0.0	0.0
Royalties and other revenues	0.0	0.0	0.0	0.0
Total revenues	0.0	0.0	0.0	0.0
Costs and expenses:
Cost of sales	0.0	0.0	0.0	0.0
Research and development	0.0	0.0	0.0	0.0
Selling, general and administrative	(2.5)	9.0	33.3	22.5
Amortization of acquired intangibles	0.0	0.0	0.0	0.0
Integration and acquisition costs	0.0	0.0	0.0	0.0
Reorganization costs	0.0	0.0	0.0	0.0
Other operating expenses		0.0		0.0
Gain on sale of product rights	0.0		0.0
Total operating expenses	(2.5)	9.0	33.3	22.5
Operating (loss)/income from continuing operations	2.5	(9.0)	(33.3)	(22.5)
Interest income/(expense), net	(23.2)	(16.5)	(67.7)	(46.9)
Other income, net	(0.1)	0.1	0.8	1.3
Total other expense, net	(23.3)	(16.4)	(66.9)	(45.6)
(Loss)/income from continuing operations before income taxes and equity in losses of equity method investees	(20.8)	(25.4)	(100.2)	(68.1)
Income tax benefit/(expense)	0.0	0.4	1.9	1.7
Equity in income/(losses) of equity method investees, net of taxes	366.0	(477.8)	31.6	(1,089.2)
(Loss)/income from continuing operations, net of taxes	(386.8)	452.8	(129.9)	1,022.8
Loss from discontinued operations, net of taxes	0.0	0.0	0.0	0.0
Net (loss)/income	(386.8)	452.8	(129.9)	1,022.8
Comprehensive (loss)/income	(135.2)	409.2	(80.3)	899.2
SAIIDAC (Subsidiary Issuer)
Revenues:
Product sales	0.0	0.0	0.0	0.0
Royalties and other revenues	0.0	0.0	0.0	0.0
Total revenues	0.0	0.0	0.0	0.0
Costs and expenses:
Cost of sales	0.0	0.0	0.0	0.0
Research and development	0.0	0.0	0.0	0.0
Selling, general and administrative	0.0	0.0	0.0	0.0
Amortization of acquired intangibles	0.0	0.0	0.0	0.0
Integration and acquisition costs	0.0	0.0	0.0	0.0
Reorganization costs	0.0	0.0	0.0	0.0
Other operating expenses		0.0		0.0
Gain on sale of product rights	0.0		0.0
Total operating expenses	0.0	0.0	0.0	0.0
Operating (loss)/income from continuing operations	0.0	0.0	0.0	0.0
Interest income/(expense), net	61.7	0.0	41.5	0.0
Other income, net	0.0	0.0	0.0	0.0
Total other expense, net	61.7	0.0	41.5	0.0
(Loss)/income from continuing operations before income taxes and equity in losses of equity method investees	61.7	0.0	41.5	0.0
Income tax benefit/(expense)	(15.4)	0.0	(10.3)	0.0
Equity in income/(losses) of equity method investees, net of taxes	0.0	0.0	0.0	0.0
(Loss)/income from continuing operations, net of taxes	46.3	0.0	31.2	0.0
Loss from discontinued operations, net of taxes	0.0	0.0	0.0	0.0
Net (loss)/income	46.3	0.0	31.2	0.0
Comprehensive (loss)/income	46.3	0.0	31.2	0.0
Baxalta Inc. (Subsidiary Issuer)
Revenues:
Product sales	0.0	0.0	0.0	0.0
Royalties and other revenues	0.0	0.0	0.0	0.0
Total revenues	0.0	0.0	0.0	0.0
Costs and expenses:
Cost of sales	0.0	0.0	0.0	0.0
Research and development	0.0	0.0	0.4	0.0
Selling, general and administrative	10.8	0.0	19.4	0.0
Amortization of acquired intangibles	0.0	0.0	0.0	0.0
Integration and acquisition costs	50.0	0.0	259.7	0.0
Reorganization costs	0.0	0.0	0.0	0.0
Other operating expenses		0.0		0.0
Gain on sale of product rights	0.0		0.0
Total operating expenses	60.8	0.0	279.5	0.0
Operating (loss)/income from continuing operations	(60.8)	0.0	(279.5)	0.0
Interest income/(expense), net	(26.1)	0.0	(32.4)	0.0
Other income, net	(0.1)	0.0	7.6	0.0
Total other expense, net	(26.2)	0.0	(24.8)	0.0
(Loss)/income from continuing operations before income taxes and equity in losses of equity method investees	(87.0)	0.0	(304.3)	0.0
Income tax benefit/(expense)	18.9	0.0	77.7	0.0
Equity in income/(losses) of equity method investees, net of taxes	505.0	0.0	635.9	0.0
(Loss)/income from continuing operations, net of taxes	(573.1)	0.0	(862.5)	0.0
Loss from discontinued operations, net of taxes	0.0	0.0	0.0	0.0
Net (loss)/income	(573.1)	0.0	(862.5)	0.0
Comprehensive (loss)/income	(333.4)	0.0	(809.0)	0.0
Non-Guarantor Non-Issuer Subsidiaries
Revenues:
Product sales	3,315.4	1,576.8	7,264.8	4,476.2
Royalties and other revenues	136.7	78.2	325.7	224.8
Total revenues	3,452.1	1,655.0	7,590.5	4,701.0
Costs and expenses:
Cost of sales	1,736.2	262.7	2,762.9	718.5
Research and development	511.1	241.2	1,022.6	1,210.8
Selling, general and administrative	867.3	433.3	1,973.1	1,334.1
Amortization of acquired intangibles	354.9	132.7	702.5	352.3
Integration and acquisition costs	234.5	89.9	478.9	(46.8)
Reorganization costs	101.4	31.1	115.7	59.6
Other operating expenses		(0.7)		(13.0)
Gain on sale of product rights	(5.7)		(12.2)
Total operating expenses	3,799.7	1,190.2	7,043.5	3,615.5
Operating (loss)/income from continuing operations	(347.6)	464.8	547.0	1,085.5
Interest income/(expense), net	(190.0)	6.6	(248.3)	18.7
Other income, net	(13.5)	9.5	(24.6)	10.6
Total other expense, net	(203.5)	16.1	(272.9)	29.3
(Loss)/income from continuing operations before income taxes and equity in losses of equity method investees	(551.1)	480.9	274.1	1,114.8
Income tax benefit/(expense)	226.1	21.9	149.1	7.3
Equity in income/(losses) of equity method investees, net of taxes	0.9	0.7	1.9	1.6
(Loss)/income from continuing operations, net of taxes	(325.9)	502.1	421.3	1,120.5
Loss from discontinued operations, net of taxes	(18.3)	(24.3)	(257.5)	(31.3)
Net (loss)/income	(344.2)	477.8	163.8	1,089.2
Comprehensive (loss)/income	(583.9)	434.2	(278.0)	965.6
Non-Guarantor Subsidiaries of SAIIDAC Notes
Revenues:
Product sales	3,315.4	1,576.8	7,264.8	4,476.2
Royalties and other revenues	136.7	78.2	325.7	224.8
Total revenues	3,452.1	1,655.0	7,590.5	4,701.0
Costs and expenses:
Cost of sales	1,736.2	262.7	2,762.9	718.5
Research and development	511.1	241.2	1,023.0	1,210.8
Selling, general and administrative	878.1	433.3	1,992.5	1,334.1
Amortization of acquired intangibles	354.9	132.7	702.5	352.3
Integration and acquisition costs	284.5	89.9	738.6	(46.8)
Reorganization costs	101.4	31.1	115.7	59.6
Other operating expenses		(0.7)		(13.0)
Gain on sale of product rights	(5.7)		(12.2)
Total operating expenses	3,860.5	1,190.2	7,323.0	3,615.5
Operating (loss)/income from continuing operations	(408.4)	464.8	267.5	1,085.5
Interest income/(expense), net	(216.1)	6.6	(280.7)	18.7
Other income, net	(13.6)	9.5	(17.0)	10.6
Total other expense, net	(229.7)	16.1	(297.7)	29.3
(Loss)/income from continuing operations before income taxes and equity in losses of equity method investees	(638.1)	480.9	(30.2)	1,114.8
Income tax benefit/(expense)	245.0	21.9	226.8	7.3
Equity in income/(losses) of equity method investees, net of taxes	505.9	0.7	637.8	1.6
(Loss)/income from continuing operations, net of taxes	(899.0)	502.1	(441.2)	1,120.5
Loss from discontinued operations, net of taxes	(18.3)	(24.3)	(257.5)	(31.3)
Net (loss)/income	(917.3)	477.8	(698.7)	1,089.2
Comprehensive (loss)/income	(917.3)	434.2	(1,087.0)	965.6
Non-Guarantor Subsidiaries of Baxalta Notes
Revenues:
Product sales	3,315.4	1,576.8	7,264.8	4,476.2
Royalties and other revenues	136.7	78.2	325.7	224.8
Total revenues	3,452.1	1,655.0	7,590.5	4,701.0
Costs and expenses:
Cost of sales	1,736.2	262.7	2,762.9	718.5
Research and development	511.1	241.2	1,022.6	1,210.8
Selling, general and administrative	867.3	433.3	1,973.1	1,334.1
Amortization of acquired intangibles	354.9	132.7	702.5	352.3
Integration and acquisition costs	234.5	89.9	478.9	(46.8)
Reorganization costs	101.4	31.1	115.7	59.6
Other operating expenses		(0.7)		(13.0)
Gain on sale of product rights	(5.7)		(12.2)
Total operating expenses	3,799.7	1,190.2	7,043.5	3,615.5
Operating (loss)/income from continuing operations	(347.6)	464.8	547.0	1,085.5
Interest income/(expense), net	(128.3)	6.6	(206.8)	18.7
Other income, net	(13.5)	9.5	(24.6)	10.6
Total other expense, net	(141.8)	16.1	(231.4)	29.3
(Loss)/income from continuing operations before income taxes and equity in losses of equity method investees	(489.4)	480.9	315.6	1,114.8
Income tax benefit/(expense)	210.7	21.9	138.8	7.3
Equity in income/(losses) of equity method investees, net of taxes	0.9	0.7	1.9	1.6
(Loss)/income from continuing operations, net of taxes	(279.6)	502.1	452.5	1,120.5
Loss from discontinued operations, net of taxes	(18.3)	(24.3)	(257.5)	(31.3)
Net (loss)/income	(297.9)	477.8	195.0	1,089.2
Comprehensive (loss)/income	$ (537.6)	$ 434.2	$ (246.8)	$ 965.6