XML 22 R11.htm IDEA: XBRL DOCUMENT
v3.21.1

Earnings Per Share | 3 Months Ended
--- | ---
Mar. 31, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Our basic earnings per share calculations are based on the weighted average number of common shares outstanding during the period. Potentially dilutive securities include outstanding stock options, restricted share units, deferred stock units and performance-based restricted share units. The effect of potentially dilutive securities is reflected in diluted earnings per common share by application of the treasury method. Diluted earnings per share gives effect to all potentially dilutive common shares outstanding during the period.
| Three Months Ended
| March 31,
(in millions, except per share data) | 2021 |  | 2020
Net income attributable to common shareholders | $ | 108.4 |  |  | $ | 62.8 |
Average basic shares outstanding | 58.2 |  |  | 58.8 |
Effect of dilutive share-based awards | 0.7 |  |  | 0.8 |
Average diluted shares outstanding | 58.9 |  |  | 59.6 |
Earnings per basic share | $ | 1.86 |  |  | $ | 1.07 |
Earnings per diluted share | $ | 1.84 |  |  | $ | 1.05 |
The computation of diluted earnings per share excludes the effect of the potentially anti-dilutive securities which was 1.8 million and 1.4 million for the three month periods ending March 31, 2021 and 2020, respectively.

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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
Name: | us-gaap_EarningsPerShareTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration