Acquisitions and Discontinued Operations - Components of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Business Combination And Disposal Groups, Including Discontinued Operations, Disclosure [Abstract]
Cash and cash equivalents	$ 27.0					$ 27.0
Net sales					$ 693.9	2,548.2	$ 3,755.4
Cost of goods sold					424.0	1,596.2	2,457.1
Gross profit					269.9	952.0	1,298.3
Selling, general and administrative					237.8	589.2	803.2
Research and development					14.6	48.3	59.0
Operating income					17.5	314.5	436.1
Income from discontinued operations before income taxes					31.8	317.1	418.5
Income tax provision (benefit)					6.1	(54.2)	75.1
Income from discontinued operations, net of tax					25.7	371.3	343.4
Gain from sale / impairment of discontinued operations before income taxes					0.0	(183.5)	(0.6)
Provision for income taxes					0.0	2.4	0.0
Gain from sale / impairment of discontinued operations, net of tax	17.8	$ 1.7	$ (200.6)	$ 0.0	0.0	(181.1)	$ (0.6)
Accounts receivable, net	348.5					348.5
Inventories	224.1					224.1
Other current assets	108.4					108.4
Current assets held for sale	708.0				0.0	708.0		$ 711.8
Property, plant and equipment, net	265.8					265.8
Goodwill	2,238.2					2,238.2
Intangibles, net	1,236.6					1,236.6
Other non-current assets	249.0					249.0
Non-current assets held for sale	3,989.6				0.0	3,989.6		3,788.0
Accounts payable	174.1					174.1
Employee compensation and benefits	70.8					70.8
Other current liabilities	115.9					115.9
Current liabilities held for sale	360.8				0.0	360.8
Pension and other post-retirement compensation and benefits	189.2					189.2
Deferred tax liabilities	286.2					286.2
Other non-current liabilities	61.6					61.6
Non-current liabilities held for sale	$ 537.0				$ 0.0	$ 537.0		$ 510.4