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Earnings Per Share and Equity - (Tables)
3 Months Ended
Apr. 03, 2020
Earnings Per Share [Abstract]  
Summary of Earnings Per Share
Net income (loss) per common share attributable to ON Semiconductor Corporation is calculated as follows (in millions, except per share data): 
Quarters Ended
 April 3, 2020March 29, 2019
Net income (loss) attributable to ON Semiconductor Corporation$(14.0) $114.1  
Basic weighted-average common shares outstanding410.6  410.6  
Dilutive effect of share-based awards—  3.2  
Dilutive effect of convertible notes—  3.9  
Diluted weighted-average common shares outstanding410.6  417.7  
Net income (loss) per common share attributable to ON Semiconductor Corporation:
Basic$(0.03) $0.28  
Diluted$(0.03) $0.27  
Schedule of Share Repurchase Program
Information relating to the Share Repurchase Program during the quarter ended April 3, 2020 and March 29, 2019 is as follows (in millions, except per share data):
Quarters Ended
 April 3, 2020March 29, 2019
Number of repurchased shares (1)3.6  4.4  
Aggregate purchase price$65.3  $75.7  
Fees, commissions and other expenses0.1  0.1  
Less: Ending accrued share repurchases (2)—  (0.8) 
Total cash used for share repurchases$65.4  $75.0  
Weighted-average purchase price per share (3)$18.08  $17.17  

(1) None of these shares had been reissued or retired as of April 3, 2020, but may be reissued or retired by the Company at a later date.
(2) Represents unpaid amounts recorded in accrued expenses and other current liabilities.
(3) Exclusive of fees, commissions and other expenses.