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Earnings Per Common Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Common Share |
Earnings Per Common Share | 14. Earnings Per Common Share The computations of the basic and diluted per share amounts were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended
​ | ​ | March 31,
​ |  | 2021 |  | 2020
​ | ​ | (in millions, except per share data)
Net income | ​ | $ | 516.3 | ​ | $ | 285.0
Subtract: | ​ | ​ | ​ | ​ | ​ | ​
Net loss attributable to noncontrolling interest | ​ | ​ | (0.8) | ​ | ​ | (3.9)
Adjustments to redemption amounts of redeemable noncontrolling interests | ​ | ​ | 1.9 | ​ | ​ | —
Total | ​ | $ | 515.2 | ​ | $ | 288.9
Weighted-average shares outstanding: | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | ​ | 272.9 | ​ | ​ | 275.0
Dilutive effects: | ​ | ​ | ​ | ​ | ​ | ​
Stock options | ​ | ​ | 0.8 | ​ | ​ | 0.5
Restricted stock units | ​ | ​ | 2.0 | ​ | ​ | 1.6
Performance share awards | ​ | ​ | 0.3 | ​ | ​ | 0.1
Diluted | ​ | ​ | 276.0 | ​ | ​ | 277.2
Net income per common share: | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 1.89 | ​ | $ | 1.05
Diluted | ​ | $ | 1.87 | ​ | $ | 1.04
​ The calculation of diluted earnings per share for the three months ended March 31, 2021 and 2020, excludes the incremental effect related to certain outstanding stock-based compensation grants due to their anti-dilutive effect.

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