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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | (In millions)
Weighted-average shares outstanding (basic) |  | 121.9 |  |  | 121.5 |  |  | 121.8 |  |  | 121.4 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options and restricted stock units |  | 1.8 |  |  | 1.5 |  |  | 1.7 |  |  | 1.3 |
Weighted-average shares outstanding (diluted) |  | 123.7 |  |  | 123.0 |  |  | 123.5 |  |  | 122.7 |
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, 2021 and 2020, respectively.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (In millions)
Allowance for doubtful accounts, beginning of period | $ | 11.2 |  |  | $ | 16.9 |  |  | $ | 12.9 |  |  | $ | 11.2 |
Current period bad debt expense | 1.2 |  |  | 0.2 |  |  | 1.2 |  |  | 7.1 |
Write-offs, net of recoveries | (1.1) |  |  | (1.3) |  |  | (2.8) |  |  | (2.5) |
Allowance for doubtful accounts, end of period | $ | 11.3 |  |  | $ | 15.8 |  |  | $ | 11.3 |  |  | $ | 15.8 |

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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=124255953&loc=SL82919249-210447 + 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=124432515&loc=d3e3550-109257 + Details
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