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Stock-Based Compensation
9 Months Ended
Feb. 29, 2020
Stock-Based Compensation [Abstract]  
Stock-Based Compensation Stock-Based Compensation

The following table summarizes the stock-based compensation expense and related income tax effect for the three and nine months ended:
 
Three Months Ended
 
Nine Months Ended
(In millions)
February 29, 2020
 
March 2, 2019
 
February 29, 2020
 
March 2, 2019
Stock-based compensation expense
$
2.5

 
$
2.2

 
$
7.9

 
$
7.2

Related income tax effect
0.6

 
0.5

 
1.8

 
1.6



Certain of the Company's equity-based compensation awards contain provisions that allow for continued vesting into retirement. Stock-based awards are considered fully vested for expense attribution purposes when the employee's retention of the award is no longer contingent on providing subsequent service.