Guarantor Financial Information (Consolidating Statements of Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Product sales	$ 3,412.3	$ 1,627.3
Royalties and other revenues	160.0	82.0
Total revenues	3,572.3	1,709.3
Costs and expenses:
Cost of sales	1,327.0	248.6
Research and development	379.3	217.1
Selling, general and administrative	888.9	474.9
Amortization of acquired intangible assets	364.0	134.6
Integration and acquisition costs	116.0	91.1
Reorganization costs	5.5	3.3
Gain on sale of product rights	(5.5)	(4.2)
Total operating expenses	3,075.2	1,165.4
Operating income from continuing operations	497.1	543.9
Interest (expense) / income, net	(139.2)	(43.7)
Other income, net	4.5	(8.5)
Total other expense, net	(134.7)	(52.2)
Income from continuing operations before income taxes and equity in losses of equity method investees	362.4	491.7
Income taxes	(6.8)	(82.1)
Equity in income/(losses) of equity method investees, net of taxes	0.8	0.1
Income from continuing operations, net of taxes	354.8	409.5
Gain from discontinued operations, net of taxes	20.2	9.5
Net income	375.0	419.0
Comprehensive (loss)/income	645.5	443.4
Eliminations
Revenues:
Product sales	0.0	0.0
Royalties and other revenues	0.0	0.0
Total revenues	0.0	0.0
Costs and expenses:
Cost of sales	0.0	0.0
Research and development	0.0	0.0
Selling, general and administrative	0.0	0.0
Amortization of acquired intangible assets	0.0	0.0
Integration and acquisition costs	0.0	0.0
Reorganization costs	0.0	0.0
Gain on sale of product rights	0.0	0.0
Total operating expenses	0.0	0.0
Operating income from continuing operations	0.0	0.0
Interest (expense) / income, net	0.0	0.0
Other income, net	0.0	0.0
Total other expense, net	0.0	0.0
Income from continuing operations before income taxes and equity in losses of equity method investees	0.0	0.0
Income taxes	0.0	0.0
Equity in income/(losses) of equity method investees, net of taxes	291.0	457.2
Income from continuing operations, net of taxes	(291.0)	(457.2)
Gain from discontinued operations, net of taxes	0.0	0.0
Net income	(291.0)	(457.2)
Comprehensive (loss)/income	(806.8)	(481.6)
Shire plc (Parent Guarantor)
Revenues:
Product sales	0.0	0.0
Royalties and other revenues	0.0	0.0
Total revenues	0.0	0.0
Costs and expenses:
Cost of sales	0.0	0.0
Research and development	0.0	0.0
Selling, general and administrative	14.0	17.0
Amortization of acquired intangible assets	0.0	0.0
Integration and acquisition costs	0.0
Reorganization costs	0.0	0.0
Gain on sale of product rights	0.0	0.0
Total operating expenses	14.0	17.0
Operating income from continuing operations	(14.0)	(17.0)
Interest (expense) / income, net	(30.3)	(21.9)
Other income, net	0.0	(0.3)
Total other expense, net	(30.3)	(22.2)
Income from continuing operations before income taxes and equity in losses of equity method investees	(44.3)	(39.2)
Income taxes	1.5	1.0
Equity in income/(losses) of equity method investees, net of taxes	(417.8)	(457.2)
Income from continuing operations, net of taxes	375.0	419.0
Gain from discontinued operations, net of taxes	0.0	0.0
Net income	375.0	419.0
Comprehensive (loss)/income	645.5	443.4
SAIIDAC (SAIIDAC Notes Subsidiary Issuer)
Revenues:
Product sales	0.0	0.0
Royalties and other revenues	0.0	0.0
Total revenues	0.0	0.0
Costs and expenses:
Cost of sales	0.0	0.0
Research and development	0.0	0.0
Selling, general and administrative	0.0	0.0
Amortization of acquired intangible assets	0.0	0.0
Integration and acquisition costs	0.0	0.0
Reorganization costs	0.0	0.0
Gain on sale of product rights	0.0	0.0
Total operating expenses	0.0	0.0
Operating income from continuing operations	0.0	0.0
Interest (expense) / income, net	5.4	(21.8)
Other income, net	0.0	0.0
Total other expense, net	5.4	(21.8)
Income from continuing operations before income taxes and equity in losses of equity method investees	5.4	(21.8)
Income taxes	(1.3)	5.5
Equity in income/(losses) of equity method investees, net of taxes	0.0	0.0
Income from continuing operations, net of taxes	4.1	(16.3)
Gain from discontinued operations, net of taxes	0.0	0.0
Net income	4.1	(16.3)
Comprehensive (loss)/income	4.1	(16.3)
Baxalta Inc. (Baxalta Notes Subsidiary Issuer and SAIIDAC Notes Subsidiary Guarantor)
Revenues:
Product sales	0.0	0.0
Royalties and other revenues	0.0	0.0
Total revenues	0.0	0.0
Costs and expenses:
Cost of sales	1.2	0.0
Research and development	0.0	0.0
Selling, general and administrative	5.7	0.0
Amortization of acquired intangible assets	0.0	0.0
Integration and acquisition costs	25.6	0.0
Reorganization costs	0.0	0.0
Gain on sale of product rights	0.0	0.0
Total operating expenses	32.5	0.0
Operating income from continuing operations	(32.5)	0.0
Interest (expense) / income, net	(21.4)	0.0
Other income, net	0.5	0.0
Total other expense, net	(20.9)	0.0
Income from continuing operations before income taxes and equity in losses of equity method investees	(53.4)	0.0
Income taxes	(19.9)	0.0
Equity in income/(losses) of equity method investees, net of taxes	126.8	0.0
Income from continuing operations, net of taxes	(200.1)	0.0
Gain from discontinued operations, net of taxes	0.0	0.0
Net income	(200.1)	0.0
Comprehensive (loss)/income	48.7	0.0
Non-Guarantor Non-Issuer Subsidiaries
Revenues:
Product sales	3,412.3	1,627.3
Royalties and other revenues	160.0	82.0
Total revenues	3,572.3	1,709.3
Costs and expenses:
Cost of sales	1,325.8	248.6
Research and development	379.3	217.1
Selling, general and administrative	869.2	457.9
Amortization of acquired intangible assets	364.0	134.6
Integration and acquisition costs	90.4	91.1
Reorganization costs	5.5	3.3
Gain on sale of product rights	(5.5)	(4.2)
Total operating expenses	3,028.7	1,148.4
Operating income from continuing operations	543.6	560.9
Interest (expense) / income, net	(92.9)	0.0
Other income, net	4.0	(8.2)
Total other expense, net	(88.9)	(8.2)
Income from continuing operations before income taxes and equity in losses of equity method investees	454.7	552.7
Income taxes	12.9	(88.6)
Equity in income/(losses) of equity method investees, net of taxes	0.8	0.1
Income from continuing operations, net of taxes	466.8	464.0
Gain from discontinued operations, net of taxes	20.2	9.5
Net income	487.0	473.5
Comprehensive (loss)/income	754.0	497.9
Non-Guarantor Subsidiaries of Baxalta Notes
Revenues:
Product sales	3,412.3	1,627.3
Royalties and other revenues	160.0	82.0
Total revenues	3,572.3	1,709.3
Costs and expenses:
Cost of sales	1,325.8	248.6
Research and development	379.3	217.1
Selling, general and administrative	869.2	457.9
Amortization of acquired intangible assets	364.0	134.6
Integration and acquisition costs	90.4	91.1
Reorganization costs	5.5	3.3
Gain on sale of product rights	(5.5)	(4.2)
Total operating expenses	3,028.7	1,148.4
Operating income from continuing operations	543.6	560.9
Interest (expense) / income, net	(87.5)	(21.8)
Other income, net	4.0	(8.2)
Total other expense, net	(83.5)	(30.0)
Income from continuing operations before income taxes and equity in losses of equity method investees	460.1	530.9
Income taxes	11.6	(83.1)
Equity in income/(losses) of equity method investees, net of taxes	0.8	0.1
Income from continuing operations, net of taxes	470.9	447.7
Gain from discontinued operations, net of taxes	20.2	9.5
Net income	491.1	457.2
Comprehensive (loss)/income	$ 758.1	$ 481.6