Acquisitions and Divestitures - Divestitures (Details) € in Millions, $ in Millions									3 Months Ended						6 Months Ended	12 Months Ended
	Dec. 20, 2017 product	Nov. 21, 2017 USD ($)	Aug. 25, 2017 EUR (€)	Aug. 25, 2017 USD ($)	Apr. 06, 2017 USD ($)	Feb. 01, 2017 USD ($)	Jan. 03, 2017 USD ($)	Aug. 05, 2016 USD ($)	Sep. 30, 2017 USD ($)	Jul. 01, 2017 USD ($)	Apr. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 01, 2016 USD ($)	Jul. 02, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 27, 2015 USD ($)
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets															$ 0.0	$ 154.6	$ 69.1	$ 0.0
Gain (loss) on disposition of business											$ 21.8
Guarantor maximum exposure																34.9
Net sales threshold for 1.5 million milestone payment																25.0
Net sales threshold for 5 million milestone payment																$ 50.0
Unrecorded gain contingency, royalty payment percentage																2.50%
Impairment charge									$ 3.3			$ 4.5	$ 10.2	$ 10.5
First
Business Acquisition [Line Items]
Gain contingency, unrecorded amount																$ 1.5
Second
Business Acquisition [Line Items]
Gain contingency, unrecorded amount																$ 5.0
ANDA
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets							$ 15.0
CHCA
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets						$ 7.7		$ 61.8
Other
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets					$ 22.2
Impairment charge																	35.3
CHCI
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets			€ 12.7	$ 15.1
Impairment charge										$ 3.7
CHCA
Business Acquisition [Line Items]
Impairment charge																	$ 6.2
Development-Stage Rx Products
Business Acquisition [Line Items]
Number of products sold | product	1
Held for sale | Israel API
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets		$ 110.0