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Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 29, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Stock-based compensation expense [Line Items]            
Share based compensation expense   $ 43.5 $ 39.6   $ 129.5 $ 127.5
Income tax benefit   9.2 8.2   28.2 27.3
Net income effect of share-based compensation   34.3 31.4   101.3 100.2
Awards assumed       $ 53.9    
Microsemi Corporation | Restricted Stock Units (RSUs)            
Stock-based compensation expense [Line Items]            
Share based compensation expense           53.5
Awards assumed $ 175.4          
Compensation costs recognized 53.9          
Total compensation cost not yet recognized $ 121.5          
Accelerated compensation costs           17.3
Inventory            
Stock-based compensation expense [Line Items]            
Capitalized share-based compensation expense   5.1 4.7   15.4 12.6
Share-based compensation expense previously capitalized   5.7 3.4   15.8 10.9
Inventory | Microsemi Corporation | Restricted Stock Units (RSUs)            
Stock-based compensation expense [Line Items]            
Capitalized share-based compensation expense           2.6
Cost of sales            
Stock-based compensation expense [Line Items]            
Share based compensation expense   5.7 3.4   15.8 10.9
Research and development            
Stock-based compensation expense [Line Items]            
Share based compensation expense   21.2 19.4   63.0 53.2
Selling, general and administrative            
Stock-based compensation expense [Line Items]            
Share based compensation expense   16.6 16.6   50.7 46.1
Special charges (income) and other, net            
Stock-based compensation expense [Line Items]            
Share based compensation expense   $ 0.0 $ 0.2   $ 0.0 $ 17.3