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Supplementary Financial Information - Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Supplementary Financial Information - Selected Quarterly Financial Data (Unaudited)
Note 19: Supplementary Financial Information - Selected Quarterly Financial Data (Unaudited)    
                
Consolidated unaudited quarterly financial information is as follows (in millions, except per share data):
Quarters ended in 2020
April 3July 3October 2December 31
Revenue$1,277.9 $1,213.5 $1,317.3 $1,446.3 
Gross Profit (exclusive of the amortization of acquisition-related intangible assets)402.7 374.3 441.2 497.6 
Net income (loss) attributable to ON Semiconductor Corporation(14.0)(1.4)160.6 89.0 
Diluted net income (loss) per common share attributable to ON Semiconductor Corporation(0.03)0.00 0.38 0.21 
Quarters ended in 2019
March 29June 28September 27 (1)December 31
Revenue$1,386.6 $1,347.7 $1,381.8 $1,401.8 
Gross Profit (exclusive of the amortization of acquisition-related intangible assets)513.7 499.0 475.2 485.7 
Net income (loss) attributable to ON Semiconductor Corporation114.1 101.8 (60.7)56.5 
Diluted net income (loss) per common share attributable to ON Semiconductor Corporation0.27 0.24 (0.15)0.14 
(1) The net loss for the quarter ended September 27, 2019 was primarily due to the expensing of $169.5 million relating to the settlement of litigation with PI.