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Share-Based Compensation
 6 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation SHARE-BASED COMPENSATION
We have various share-based compensation programs, which include deferred stock units, stock options, and restricted stock. During the six months ended 31 March 2018, we granted market-based and time-based deferred stock units. Under all programs, the terms of the awards are fixed at the grant date. We issue shares from treasury stock upon the payout of deferred stock units, the exercise of stock options, and the issuance of restricted stock awards. As of 31 March 2018, there were 4,610,336 shares available for future grant under our Long-Term Incentive Plan (LTIP), which is shareholder approved.
Share-based compensation cost recognized in continuing operations on the consolidated income statements is summarized below:
 
 
Three Months Ended
 
Six Months Ended
 
 
31 March
 
31 March
 
 
2018
 
2017
 
2018
 
2017
Before-tax share-based compensation cost
 

$10.7

 

$9.5

 

$22.5

 

$18.5

Income tax benefit
 
(2.1
)
 
(3.3
)
 
(5.3
)
 
(6.3
)
After-tax share-based compensation cost
 

$8.6

 

$6.2

 

$17.2

 

$12.2


Before-tax share-based compensation cost is primarily included in "Selling and administrative" on our consolidated income statements. The amount of share-based compensation cost capitalized in the first six months of fiscal year 2018 and 2017 was not material.
Deferred Stock Units
During the six months ended 31 March 2018, we granted 104,874 market-based deferred stock units. The market-based deferred stock units are earned out at the end of a performance period beginning 1 October 2017 and ending 30 September 2020, conditioned on the level of the Company’s total shareholder return in relation to a defined peer group over the three-year performance period.
The market-based deferred stock units had an estimated grant-date fair value of $202.50 per unit, which was estimated using a Monte Carlo simulation model. The model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the grant and calculates the fair value of the awards. We generally expense the grant-date fair value of these awards on a straight-line basis over the vesting period. The calculation of the fair value of market-based deferred stock units used the following assumptions:
Expected volatility
 
18.7
%
Risk-free interest rate
 
1.9
%
Expected dividend yield
 
2.6
%

In addition, during the six months ended 31 March 2018, we granted 138,340 time-based deferred stock units at a weighted average grant-date fair value of $162.12.