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Earnings Per Share and Equity - (Tables)
 9 Months Ended
Oct. 02, 2020
Earnings Per Share [Abstract]  
Summary of Earnings Per Share
Net income (loss) per share of common stock attributable to ON Semiconductor Corporation is calculated as follows (in millions, except per share data): 
Quarters EndedNine Months Ended
 October 2, 2020September 27, 2019October 2, 2020September 27, 2019
Net income (loss) attributable to ON Semiconductor Corporation$160.6 $(60.7)$145.2 $155.2 
Basic weighted-average shares of common stock outstanding410.8 410.4 410.5 411.0 
Dilutive effect of share-based awards1.8 — 1.6 1.7 
Dilutive effect of convertible notes5.7 — 2.3 2.6 
Diluted weighted-average shares of common stock outstanding418.3 410.4 414.4 415.3 
Net income (loss) per share of common stock attributable to ON Semiconductor Corporation:
Basic$0.39 $(0.15)$0.35 $0.38 
Diluted$0.38 $(0.15)$0.35 $0.37 
Schedule of Share Repurchase Program
Activity under the Share Repurchase Program during the quarter and nine months ended October 2, 2020 and September 27, 2019 were as follows (in millions, except per share data):
Quarters EndedNine Months Ended
 October 2, 2020September 27, 2019October 2, 2020September 27, 2019
Number of repurchased shares (1)— 0.8 3.6 7.8 
Aggregate purchase price$— $13.1 $65.3 $138.9 
Fees, commissions and other expenses— 0.1 0.1 0.1 
Total cash used for share repurchases$— $13.2 $65.4 $139.0 
Weighted-average purchase price per share (2)$— $17.18 $18.08 $17.89 

(1)    None of these shares had been reissued or retired as of October 2, 2020, but may be reissued or retired later.
(2)    Exclusive of fees, commissions and other expenses.