SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2020

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,
	2020	2019
	(In millions)
Weighted-average shares outstanding (basic)	121.3	120.7
Effect of dilutive securities:
Stock options and restricted stock units	1.3	0.9
Weighted-average shares outstanding (diluted)	122.6	121.6

Items Measured at Fair Value on Recurring Basis

The following table presents items measured at fair value on a recurring basis:

			Fair Value Measurements at Reporting Date Using:
Description	Fair Value of Assets (Liabilities) at March 31, 2020		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Deferred Compensation Plan Assets(1)	$	34.4	$	34.4	$	—	$	—
Deferred Compensation Plan Liability(1)	(34.4)		—		(34.4)		—
Total	$	—	$	34.4	$	(34.4)	$	—

(1)        We maintain deferred compensation plans that allow for certain management employees to defer the receipt of compensation (such as salary, incentive compensation and commissions) until a later date based on the terms of the plan. The liability representing benefits accrued for plan participants is valued at the quoted market prices of the participants’ investment elections. The asset consists of mutual funds reflective of the participants’ investment selections and is valued at daily quoted market prices.

Rollforward of Allowance for Doubtful Accounts

Below is a rollforward of our allowance for doubtful accounts for the three months ended March 31, 2020 and 2019, respectively.

	Three Months Ended March 31,
	2020		2019
	(In millions)
Allowance for doubtful accounts, beginning of period	$	11.2	$	10.9
Current period bad debt expense	2.5		2.0
Write-offs, net of recoveries	(0.3)		(0.4)
Allowance for doubtful accounts, end of period	$	13.4	$	12.5