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Net income per common share - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] |  |  |  |
Accelerated Share Repurchases Final Price Paid Per Share | $ 53.58 |  |  |
Initial shares received as part of an accelerated share repurchase program |  | 3,500,000 |  |
Accelerated share repurchases settlement receipt | $ 250 |  | $ 125 | $ 75
Common Shares Repurchased Accelerated Share Repurchase Agreements | 1,165,607 |  | 2,438,180 | 1,847,372

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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