Assets Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge	$ 3.3	$ 4.5	$ 10.2	$ 10.5
Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge						$ 35.3
Held for sale | CHCA
Assets held for sale
Current assets		0.0				0.0
Goodwill		0.0				0.0
Property, plant and equipment		13.5				13.5
Other assets		0.0				0.0
Less: impairment reserves		(3.7)				(3.7)
Total assets held for sale		9.8				9.8
Liabilities held for sale
Current liabilities		0.1				0.1
Other liabilities		0.0				0.0
Total liabilities held for sale		0.1				0.1
Held for sale | Other
Assets held for sale
Current assets		5.1				5.1
Goodwill		5.5				5.5
Property, plant and equipment		33.2				33.2
Other assets		3.8				3.8
Less: impairment reserves		(35.3)				(35.3)
Total assets held for sale		12.3				12.3
Liabilities held for sale
Current liabilities		1.9				1.9
Other liabilities		1.9				1.9
Total liabilities held for sale		$ 3.8				3.8
Held for sale | API
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge					$ 29.0
Held for sale | API | Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge						6.3	$ 29.0
Held for sale | Animal Health pet treats | CHCA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge						$ 3.7