Acquisitions and Divestitures - Goodwill Allocation (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Jun. 27, 2015	Jun. 28, 2014	Dec. 18, 2013
Business Combination Segment Allocation [Line Items]
Goodwill	$ 4,049.4	$ 5,152.7	$ 4,721.2	$ 3,473.1
CHCA
Business Combination Segment Allocation [Line Items]
Goodwill	1,810.6	1,814.3	1,817.2	1,827.9
RX
Business Combination Segment Allocation [Line Items]
Goodwill	1,086.6	1,084.1	1,086.0	1,098.7
Specialty Sciences
Business Combination Segment Allocation [Line Items]
Goodwill	$ 0.0	$ 199.6	$ 199.6	$ 200.7
Elan
Business Combination Segment Allocation [Line Items]
Goodwill					$ 2,332.0
Elan | CHCA
Business Combination Segment Allocation [Line Items]
Goodwill					1,287.4
Elan | RX
Business Combination Segment Allocation [Line Items]
Goodwill					845.1
Elan | Specialty Sciences
Business Combination Segment Allocation [Line Items]
Goodwill					$ 199.5