XML 44 R21.htm IDEA: XBRL DOCUMENT
v3.24.0.1

EARNINGS PER SHARE | 12 Months Ended
--- | ---
Dec. 31, 2023
EARNINGS PER SHARE |
EARNINGS PER SHARE | 14. EARNINGS PER SHARE ​ Basic earnings per share are determined by dividing net income by the weighted-average common shares outstanding during the year. The calculation of diluted earnings per share includes the dilutive effect of unexercised non-qualified stock options and non-vested stock units. The computation of weighted average dilutive shares outstanding excluded a nominal amount of anti-dilutive non-qualified stock options for each of the years 2023, 2022 and 2021. ​ The denominators used to compute basic and diluted earnings per share for the years ended December 31, 2023, 2022 and 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2023 | ​ | Year Ended December 31, 2022 | ​ | Year Ended December 31, 2021 |
​ |  | ​ | ​ |  | Weighted |  | Per |  | ​ | ​ |  | Weighted |  | Per |  | ​ | ​ |  | Weighted |  | Per |
​ | ​ | ​ | ​ | ​ | Average | ​ | Common | ​ | ​ | ​ | ​ | Average | ​ | Common | ​ | ​ | ​ | ​ | Average | ​ | Common |
​ | ​ | Net | ​ | Common | ​ | Share | ​ | Net | ​ | Common | ​ | Share | ​ | Net | ​ | Common | ​ | Share |
(In millions, except per share amounts) | ​ | Income | ​ | Shares | ​ | Amount | ​ | Income | ​ | Shares | ​ | Amount | ​ | Income | ​ | Shares | ​ | Amount |
Basic: | ​ | $ | 297.1 |  | 35.3 | ​ | $ | 8.42 | ​ | $ | 1,063.9 |  | 39.0 | ​ | $ | 27.28 | ​ | $ | 927.4 |  | 42.8 | ​ | $ | 21.67 | ​
Effect of Dilutive Securities: | ​ | ​ | — |  | 0.4 | ​ | ​ | (0.10) | ​ | ​ | — |  | 0.3 | ​ | ​ | (0.21) | ​ | ​ | — |  | 0.4 | ​ | ​ | (0.20) | ​
Diluted: | ​ | $ | 297.1 | ​ | 35.7 | ​ | $ | 8.32 | ​ | $ | 1,063.9 | ​ | 39.3 | ​ | $ | 27.07 | ​ | $ | 927.4 | ​ | 43.2 | ​ | $ | 21.47 | ​
​

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-3 + Details
Name: | us-gaap_EarningsPerShareTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration