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Shareholders' equity - Share Repurchase (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended
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Aug. 04, 2018 | Jul. 29, 2017
Class of Stock [Line Items] |  |
Shares repurchased (shares) | 8.8 | 8.1
Amount repurchased | $ 485.0 | $ 460.0
Average repurchase price per share (usd per share) | $ 55.06 | $ 56.91
2017 Program |  |
Class of Stock [Line Items] |  |
Amount authorized | $ 600.0 |
Shares repurchased (shares) | 7.5 |
Amount repurchased | $ 434.4 |
Average repurchase price per share (usd per share) | $ 57.64 |
2016 Program |  |
Class of Stock [Line Items] |  |
Amount authorized | $ 1,375.0 |
Shares repurchased (shares) | 1.3 | 8.1
Amount repurchased | $ 50.6 | $ 460.0
Average repurchase price per share (usd per share) | $ 39.76 | $ 56.91
Remaining authorized repurchase amount | $ 165.6 |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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