Acquisitions and Divestitures - Purchase Price Allocation for Year Ended June 2015 (Details) - USD ($) $ in Millions	May 12, 2015	Mar. 30, 2015	Oct. 31, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 27, 2015
Assets acquired:
Goodwill				$ 4,175.4	$ 4,049.4	$ 5,152.7	$ 4,721.2
Gelcaps
Business Acquisition [Line Items]
Total purchase consideration	$ 37.9
Assets acquired:
Cash and cash equivalents	4.6
Accounts receivable	7.3
Inventories	7.2
Prepaid expenses and other current assets	2.1
Property, plant and equipment, net	6.0
Goodwill	6.0
Indefinite-lived intangibles:
Total intangible assets	11.0
Other non-current assets	0.4
Total assets	44.6
Liabilities assumed:
Accounts payable	3.3
Short-term debt	0.0
Accrued liabilities	1.6
Payroll and related taxes	0.0
Accrued customer programs	0.0
Long-term debt	0.0
Net deferred income tax liabilities	1.4
Other non-current liabilities	0.4
Total liabilities	6.7
Net assets acquired	37.9
Omega
Business Acquisition [Line Items]
Total purchase consideration		$ 2,983.2
Assets acquired:
Cash and cash equivalents		14.7
Accounts receivable		222.9
Inventories		277.0
Prepaid expenses and other current assets		51.2
Property, plant and equipment, net		130.8
Goodwill		1,688.7
Indefinite-lived intangibles:
Total intangible assets		3,379.0				$ 3,379.0
Other non-current assets		2.4
Total assets		5,766.7
Liabilities assumed:
Accounts payable		225.0
Short-term debt		112.6
Accrued liabilities		49.3
Payroll and related taxes		51.3
Accrued customer programs		28.9
Long-term debt		1,471.0
Net deferred income tax liabilities		785.5
Other non-current liabilities		59.9
Total liabilities		2,783.5
Net assets acquired		2,983.2
Lumara
Business Acquisition [Line Items]
Total purchase consideration			$ 83.0
Assets acquired:
Cash and cash equivalents			0.0
Accounts receivable			2.9
Inventories			1.5
Prepaid expenses and other current assets			0.4
Property, plant and equipment, net			0.1
Goodwill			0.0
Indefinite-lived intangibles:
Total intangible assets			82.0
Other non-current assets			0.0
Total assets			86.9
Liabilities assumed:
Accounts payable			0.0
Short-term debt			0.0
Accrued liabilities			3.9
Payroll and related taxes			0.0
Accrued customer programs			0.0
Long-term debt			0.0
Net deferred income tax liabilities			0.0
Other non-current liabilities			0.0
Total liabilities			3.9
Net assets acquired			83.0
Developed product technology, formulations, and product rights | Gelcaps
Definite-lived intangibles:
Definite-lived intangibles	0.0
Developed product technology, formulations, and product rights | Omega
Definite-lived intangibles:
Definite-lived intangibles		31.4
Developed product technology, formulations, and product rights | Lumara
Definite-lived intangibles:
Definite-lived intangibles			82.0
Customer relationships and distribution networks | Gelcaps
Definite-lived intangibles:
Definite-lived intangibles	6.6
Customer relationships and distribution networks | Omega
Definite-lived intangibles:
Definite-lived intangibles		1,056.3
Customer relationships and distribution networks | Lumara
Definite-lived intangibles:
Definite-lived intangibles			0.0
Trademarks, trade names, and brands | Gelcaps
Definite-lived intangibles:
Definite-lived intangibles	0.0
Trademarks, trade names, and brands | Omega
Definite-lived intangibles:
Definite-lived intangibles		287.5
Trademarks, trade names, and brands | Lumara
Definite-lived intangibles:
Definite-lived intangibles			0.0
Trademarks, trade names, and brands | Gelcaps
Indefinite-lived intangibles:
Indefinite-lived intangibles	$ 4.4
Trademarks, trade names, and brands | Omega
Indefinite-lived intangibles:
Indefinite-lived intangibles		$ 2,003.8
Trademarks, trade names, and brands | Lumara
Indefinite-lived intangibles:
Indefinite-lived intangibles			$ 0.0