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Shareholders' equity - Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 01, 2018 | Dec. 01, 2017 | Aug. 31, 2017 | Aug. 31, 2016 | Feb. 29, 2016
2016 Stock Repurchase Program |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchase, authorized amount |  |  |  |  |  |  | $ 125.0 | $ 125.0 | $ 50.0
June 2017 ASR Program [Member] |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchase, authorized amount |  | $ 20.0 | $ 60.0 | $ 60.0 |  |  |  |  |
Repurchase of common stock (in shares) |  | 460,887 |  | 1,138,387 |  |  |  |  |
Stock repurchase, average cost per share (in USD per share) |  | $ 43.39 |  |  |  |  |  |  |
December 2017 ASR Program [Member] |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchase, authorized amount |  |  | $ 234.6 | $ 234.6 |  | $ 50.0 |  |  |
Repurchase of common stock (in shares) | 677,500 |  | 182,171 |  |  |  |  |  |
Settlement of accelerated share repurchase program |  |  |  |  |  | $ 40.0 |  |  |
Stock repurchase, average cost per share (in USD per share) | $ 59.04 |  |  |  |  |  |  |  |
2017 Stock Repurchase Program |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchase, authorized amount |  |  |  |  |  |  | $ 275.0 |  |
Repurchase of common stock (in shares) |  |  |  | 1,772,658 |  |  |  |  |
Stock repurchase, average cost per share (in USD per share) |  |  | $ 62.69 |  |  |  |  |  |
2018 Stock Repurchase Program [Member] [Member] |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchase, authorized amount |  |  |  |  | $ 100.0 |  |  |  |

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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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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: 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 + Details
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