Selected Quarterly Data - Schedule Of Selected Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Revenue	$ 756.9	$ 682.9	$ 670.1	$ 594.5	$ 676.5	$ 589.7	$ 586.1	$ 532.1	$ 2,704.4	$ 2,384.4	$ 2,131.7
Gross profit	527.2	487.0	470.9	405.0	458.8	395.8	386.5	336.8	1,890.1	1,577.9	1,413.8
Net income	$ 204.0	$ 211.0	$ 184.5	$ 136.4	$ 190.0	$ 167.3	$ 134.5	$ 97.0	$ 735.9	$ 588.8	$ 418.8
Basic net income per share (usd per share)	$ 5.26	$ 5.45	$ 4.82	$ 3.62	$ 5.09	$ 4.49	$ 3.64	$ 2.64	$ 19.21	$ 15.87	$ 11.35
Diluted net income per share (usd per share)	$ 5.13	$ 5.31	$ 4.71	$ 3.54	$ 4.99	$ 4.40	$ 3.56	$ 2.57	$ 18.73	$ 15.54	$ 11.11
Audit settlement and expiration of the statutes of limitations in multiple jurisdictions	$ 0.0	$ 15.8	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 7.8	$ 0.0
Reversal of the share-based compensation intercompany charges as a result of U.S. Tax Court opinion					0.0	29.3	0.0	0.0
Reinstatement of the 2015 federal R&D tax credit					6.4	0.0	0.0	0.0
Includes pre-tax litigation charges (recoveries)	5.5	0.0	4.4	2.2	$ (0.6)	$ 0.0	$ 6.6	$ 7.2
Includes pre-tax medical device excise tax refund benefit	$ 0.0	$ 7.1	$ 0.0	$ 0.0