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Selected Quarterly Data - Schedule Of Selected Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
Revenue	$ 892.4	$ 806.1	$ 756.2	$ 674.2	$ 756.9	$ 682.9	$ 670.1	$ 594.5	$ 3,128.9	$ 2,704.4	$ 2,384.4
Gross profit	633.3	566.8	527.9	466.1	527.2	487.0	470.9	405.0	2,194.1	1,890.1	1,577.9
Net income	$ (38.8)	$ 297.5	$ 221.5	$ 179.8	$ 204.0	$ 211.0	$ 184.5	$ 136.4	$ 660.0	$ 735.9	$ 588.8
Basic net income per share (usd per share)	$ (0.35)	$ 2.66	$ 2.00	$ 1.61	$ 1.75	$ 1.82	$ 1.61	$ 1.21	$ 5.91	$ 6.40	$ 5.29
Diluted net income per share (usd per share)	$ (0.35)	$ 2.55	$ 1.92	$ 1.56	$ 1.71	$ 1.77	$ 1.57	$ 1.18	$ 5.67	$ 6.24	$ 5.18
Income tax (expense) related to the 2017 Tax Act	$ (317.8)	$ 0.0	$ 0.0	$ 0.0					$ (47.6)
Excess tax benefits related to share-based compensation arrangements	19.9	19.7	30.6	32.6					$ 102.8	$ 0.0	$ 0.0
Certain one-time tax benefits	0.0	68.4	0.0	0.0
Pre-tax medical device excise tax refund benefit					$ 0.0	$ 7.1	$ 0.0	$ 0.0
Audit settlement and expiration of the statutes of limitations in multiple jurisdictions					0.0	15.8	0.0	0.0
Includes pre-tax litigation (charges)	$ 1.2	$ (9.7)	$ 4.5	$ (21.3)	$ (5.5)	$ 0.0	$ (4.4)	$ (2.2)

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