Fair value on recurring and non-recurring basis (Details) - USD ($)	3 Months Ended					9 Months Ended
	Oct. 01, 2016		Apr. 02, 2016	Dec. 31, 2015	Sep. 26, 2015	Oct. 01, 2016		Sep. 26, 2015	Jul. 02, 2016	Sep. 15, 2015	Jun. 27, 2015	Mar. 30, 2015	Dec. 27, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finite-Lived Intangible Assets, Gross	$ 10,138,400,000			$ 9,512,200,000		$ 10,138,400,000
Fair Value, Assets, Level 1, Level 2, Level 3 Transfers, Amount	0				$ 0	0		$ 0
Goodwill, impairment loss						967,500,000
Liabilities:
Contingent Consideration										$ 0
Measured at fair value on a recurring basis: | Fair value, inputs, level 1 [Member]
Assets:
Investment securities	53,000,000			14,900,000		53,000,000
Measured at fair value on a recurring basis: | Fair value, inputs, level 2 [Member]
Assets:
Foreign currency forward contracts	5,200,000			4,800,000		5,200,000
Liabilities:
Interest rate swap agreements	0			300,000		0
Foreign currency forward contracts	800,000			3,900,000		800,000
Total level 2 liabilities	800,000			4,200,000		800,000
Measured at fair value on a non-recurring basis: | Fair Value, Inputs, Level 3 [Member]
Assets:
Goodwill(1)	1,105,400,000	[1]		0		1,105,400,000	[1]
Indefinite-lived intangible assets(2)				1,031,800,000
Definite-lived intangible assets(3)	66,900,000			0		66,900,000
Assets held for sale, net	14,100,000			37,500,000		14,100,000
Total level 3 assets	1,858,800,000			1,069,300,000		1,858,800,000
BCH
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finite-Lived Intangible Assets, Gross	357,100,000					357,100,000
Goodwill, Gross	1,909,500,000					1,909,500,000
Goodwill, impairment loss	804,100,000					967,500,000
Intangible Assets, Gross (Excluding Goodwill)	1,200,000,000					1,200,000,000
Contingent Consideration Classified as Equity [Member] | Measured at fair value on a recurring basis: | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements	100,000				0	100,000		0
Liabilities:
Contingent Consideration	75,000,000			17,900,000	$ 0	75,000,000		$ 0	$ 44,900,000		$ 0		$ 12,400,000
Omega [Member]
Liabilities:
Contingent Consideration												$ 0
Omega [Member] | Brands [Member]
Assets:
Impairment of intangible assets, indefinite-lived (excluding goodwill)	575,700,000		$ 273,400,000			849,100,000
Liabilities:
Impairment of Intangible Assets, Finite-lived	$ 290,200,000			$ 185,100,000		$ 290,200,000

[1] (1)Goodwill with a carrying amount of $1.9 billion was written down to its implied fair value of $1.1 billion, resulting in an impairment charge of $804.1 million for the three months ended October 1, 2016; impairment charges totaled $967.5 million for the nine months ended October 1, 2016 and are included in Impairment charges on the Condensed Consolidated Statements of Operations.