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Earnings Per Common Share | 6 Months Ended
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Jun. 30, 2020
Earnings Per Common Share |
Earnings Per Common Share | 15. Earnings Per Common Share The computations of the basic and diluted per share amounts were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | For the six months ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
​ | ​ | (in millions, except per share data)
Net income | ​ | $ | 416.1 | ​ | $ | 392.1 | ​ | $ | 701.1 | ​ | $ | 844.2
Subtract: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income attributable to noncontrolling interest | ​ | ​ | 17.8 | ​ | ​ | 5.8 | ​ | ​ | 13.9 | ​ | ​ | 28.0
Total | ​ | $ | 398.3 | ​ | $ | 386.3 | ​ | $ | 687.2 | ​ | $ | 816.2
Weighted-average shares outstanding: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | ​ | 274.3 | ​ | ​ | 279.0 | ​ | ​ | 274.6 | ​ | ​ | 278.8
Dilutive effects: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options | ​ | ​ | 0.1 | ​ | ​ | 0.9 | ​ | ​ | 0.3 | ​ | ​ | 0.9
Restricted stock units | ​ | ​ | 1.1 | ​ | ​ | 1.2 | ​ | ​ | 1.4 | ​ | ​ | 1.3
Performance share awards | ​ | ​ | 0.1 | ​ | ​ | 0.1 | ​ | ​ | 0.1 | ​ | ​ | 0.2
Diluted | ​ | ​ | 275.6 | ​ | ​ | 281.2 | ​ | ​ | 276.4 | ​ | ​ | 281.2
Net income per common share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 1.45 | ​ | $ | 1.38 | ​ | $ | 2.50 | ​ | $ | 2.93
Diluted | ​ | $ | 1.45 | ​ | $ | 1.37 | ​ | $ | 2.49 | ​ | $ | 2.90
​ The calculation of diluted earnings per share for the three and six months ended June 30, 2020 and 2019, excludes the incremental effect related to certain outstanding stock-based compensation grants due to their anti-dilutive effect.

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- 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
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