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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  |  |  | Nine Months Ended September 30, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (In millions) |  |  |  |  |  |
Weighted-average shares outstanding (basic) |  | 121.5 |  |  | 121.0 |  |  | 121.4 |  |  | 120.8 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options and restricted stock units |  | 1.5 |  |  | 1.3 |  |  | 1.3 |  |  | 1.2 |
Weighted-average shares outstanding (diluted) |  | 123.0 |  |  | 122.3 |  |  | 122.7 |  |  | 122.0 |
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 September 30, 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) |  | $ | 38.5 |  |  | $ | 38.5 |  |  | $ | — |  |  | $ | — |
Deferred Compensation Plan Liability(1) |  | (38.5) |  |  | — |  |  | (38.5) |  |  | — |
Total |  | $ | — |  |  | $ | 38.5 |  |  | $ | (38.5) |  |  | $ | — |
(1) We maintain deferred compensation plans that allow for certain management employees to defer the receipt of compensation (such as salary and incentive compensation) 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 and nine months ended September 30, 2020 and 2019, respectively.
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
| (In millions) |  |  |  |  |  |
Allowance for doubtful accounts, beginning of period | $ | 16.9 |  |  | $ | 13.3 |  |  | $ | 11.2 |  |  | $ | 10.9 |
Current period bad debt expense | 0.2 |  |  | 0.9 |  |  | 7.1 |  |  | 4.6 |
Write-offs, net of recoveries | (1.3) |  |  | (1.7) |  |  | (2.5) |  |  | (3.0) |
Allowance for doubtful accounts, end of period | $ | 15.8 |  |  | $ | 12.5 |  |  | $ | 15.8 |  |  | $ | 12.5 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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