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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Net sales $ 943.7 $ 841.8 $ 1,838.5 $ 1,725.3
Cost of sales 246.2 211.1 479.8 426.7
Gross profit 697.5 630.7 1,358.7 1,298.6
Selling, general, and administrative expenses 274.9 243.8 530.9 473.4
Research and development expenses 154.1 134.4 297.3 263.1
Intellectual property litigation expenses 5.5 7.7 11.2 17.9
Change in fair value of contingent consideration liabilities, net (Note 7) 10.9 3.1 14.7 4.2
Other operating expenses, net 0.0 0.7 0.0 0.7
Operating income 252.1 241.0 504.6 539.3
Interest expense (income), net 0.0 1.4 (0.8) 3.8
Special charges (gains) (Note 4) 0.0 31.2 (7.1) 31.2
Other expense (income), net 1.1 2.8 (2.0) 5.1
Income before (benefit from) provision for income taxes 251.0 205.6 514.5 499.2
(Benefit from) provision for income taxes (31.7) 19.5 25.2 82.9
Net income $ 282.7 $ 186.1 $ 489.3 $ 416.3
Earnings per share:        
Basic (in dollars per share) $ 1.35 $ 0.88 $ 2.33 $ 1.97
Diluted (in dollars per share) $ 1.32 $ 0.86 $ 2.28 $ 1.93
Weighted-average number of common shares outstanding:        
Basic (in shares) 209.5 210.5 209.8 210.8
Diluted (in shares) 214.0 215.7 214.5 216.1