Discontinued operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 775.9	$ 362.7	$ 775.9	$ 362.7	$ 622.3	$ 417.8
Net sales	1,231.3	1,261.6	3,663.1	3,949.3
Income (Loss) from Continuing Operations before Income Taxes, Domestic	128.7	(1,902.0)	148.2	(3,204.4)
Income tax expense (benefit)	84.2	$ (311.8)	101.8	$ (550.7)
Accounts receivable, net of allowance for doubtful accounts of $6.2 million and $6.3 million, respectively	1,076.6		1,076.6		1,176.0
Inventories	821.9		821.9		795.0
Prepaid expenses and other current assets	297.4		297.4		212.0
Property, plant and equipment, net	822.3		822.3		870.1
Financial assets	0.0		0.0		2,350.0
Other intangible assets, net	3,347.4		3,347.4		3,396.8
Other non-current assets	423.3		423.3		211.9
Accounts payable	$ 477.1		$ 477.1		$ 471.7