Goodwill and Intangible Assets - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 26, 2020		Sep. 26, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill		$ 3,839,300,000		$ 3,839,300,000	$ 4,116,700,000
Goodwill impairment loss				202,400,000
BCS
Goodwill [Line Items]
Goodwill		$ 995,500,000		$ 995,500,000
Fair value of reporting unit in excess of net book value (percent)		10.00%		10.00%
Goodwill impairment loss		$ 0
RX
Goodwill [Line Items]
Goodwill	[1]	811,100,000		$ 811,100,000	$ 1,013,900,000
Goodwill impairment loss		$ 202,400,000	[1]	$ 202,400,000

[1] We had accumulated goodwill impairments of $109.2 million and $311.6 million as of December 31, 2019 and September 26, 2020