SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Reconciliation of Weighted-Average Outstanding Shares used in Calculations of Basic and Diluted EPS

A reconciliation of the weighted-average outstanding shares used in the two calculations is as follows: 

	Three Months Ended March 31,
	2021	2020
	(In millions)
Weighted-average shares outstanding (basic)	121.8	121.3
Effect of dilutive securities:
Stock options and restricted stock units	1.4	1.3
Weighted-average shares outstanding (diluted)	123.2	122.6

Rollforward of Allowance for Doubtful Accounts

Below is a rollforward of our allowance for doubtful accounts for the three months ended March 31, 2021 and 2020, respectively.

	Three Months Ended March 31,
	2021		2020
	(In millions)
Allowance for doubtful accounts, beginning of period	$	12.9	$	11.2
Current period bad debt (recoveries) expense	(0.3)		2.5
Write-offs, net of recoveries	(0.8)		(0.3)
Allowance for doubtful accounts, end of period	$	11.8	$	13.4