XML 48 R21.htm IDEA: XBRL DOCUMENT
v3.20.4

EARNINGS PER-SHARE | 12 Months Ended
--- | ---
Dec. 31, 2020
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 2020, 2019 and 2018. ​ The denominators used to compute basic and diluted earnings per share for the years ended December 31, 2020, 2019 and 2018 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2020 | ​ | Year Ended December 31, 2019 | ​ | Year Ended December 31, 2018 |
​ |  | ​ | ​ |  | 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: | ​ | $ | 193.1 |  | 43.1 | ​ | $ | 4.48 | ​ | $ | 82.7 |  | 42.8 | ​ | $ | 1.93 | ​ | $ | 109.0 |  | 42.7 | ​ | $ | 2.55 | ​
Effect of Dilutive Securities: | ​ | ​ | ​ |  | 0.4 | ​ | ​ | (0.04) | ​ | ​ | ​ |  | 0.5 | ​ | ​ | (0.02) | ​ | ​ | ​ |  | 0.3 | ​ | ​ | (0.02) | ​
Diluted: | ​ | $ | 193.1 | ​ | 43.5 | ​ | $ | 4.44 | ​ | $ | 82.7 | ​ | 43.3 | ​ | $ | 1.91 | ​ | $ | 109.0 | ​ | 43.0 | ​ | $ | 2.53 | ​
​

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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
Name: | us-gaap_EarningsPerShareTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration