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Employee plans - Narrative (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 14, 2021 USD ($) retiree | May 01, 2021 USD ($) | Jan. 31, 2021 USD ($) retiree | Dec. 31, 2020 USD ($) former_associate | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares of unissued common stock available for grant under the plans (in shares) | shares |  |  |  |  |  | 6,800,000 |  |
Matching contribution by the company as percentage of participants' contribution |  |  |  |  |  | 50.00% |  |
Percentage of eligible pay contributed by participants that will be matched |  |  |  |  |  | 6.00% |  |
Cost recognized for contribution plans |  |  |  |  |  | $ 7.5 | $ 8.8 | $ 8.2
Deferred compensation liability |  |  |  | $ 12.7 |  | 10.6 | 12.7 |
Settlement loss | $ (130.1) |  |  |  |  |  |  |
Non-cash pension settlement charge | 130.1 |  |  |  |  |  |  |
International Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Cost recognized for contribution plans |  |  |  |  |  | 16.4 | 16.2 | 19.3
Pension Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Settlement loss |  |  |  |  |  | (499.4) |  |
Non-cash pension settlement charge |  |  |  |  |  | 499.4 |  |
Estimated cash contributions by the company in next fiscal year |  |  |  |  |  | 40.2 |  |
Pension Plans | U.S. Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Group annuity contract to transfer projected benefit obligations, purchase amount | $ 235.0 |  | $ 279.0 |  |  |  |  |
Group annuity contract to transfer projected benefit obligations, number of retirees | retiree | 6,900 |  | 11,600 |  |  |  |  |
Settlement loss |  |  | $ (158.0) | $ (142.1) |  | (288.1) | (142.1) | 0.0
Lump sum payments, number of former associates | former_associate |  |  |  | 3,500 |  |  |  |
Lump -sum payments |  |  |  | $ 276.0 |  |  |  |
Non-cash pension settlement charge |  |  | $ 158.0 | $ 142.1 |  | 288.1 | 142.1 | 0.0
Pension Plans | International Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Settlement loss |  |  |  |  |  | (211.3) | 0.0 | (1.2)
Non-cash pension settlement charge |  |  |  |  |  | 211.3 | 0.0 | 1.2
Dutch Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Settlement loss |  | $ (182.5) |  |  |  |  |  |
Projected benefit obligation transferred to multiemployer plan and removed from balance sheet |  | 553.0 |  |  |  |  |  |
Non-cash pension settlement charge |  | $ 182.5 |  |  |  |  |  |
Swiss Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Settlement loss |  |  |  |  | $ (28.8) |  |  |
Projected benefit obligation transferred to multiemployer plan and removed from balance sheet |  |  |  |  | 100.0 |  |  |
Multiemployer plan, pension, significant, plan contribution |  |  |  |  | 10.0 |  |  |
Non-cash pension settlement charge |  |  |  |  | $ 28.8 |  |  |
Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated cash contributions by the company in next fiscal year |  |  |  |  |  | $ 6.0 |  |
Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Certain investments valued using net asset value as practical expedient, redemption notice period |  |  |  |  |  | 120 days |  |
Restricted Stock And Restricted Stock Units R S Us |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 18.8 | 14.5 | 13.2
Aggregate weighted-average grant-date fair value of units granted |  |  |  |  |  | 37.5 | 17.4 | 16.9
Total unrecognized compensation cost |  |  |  |  |  | $ 25.0 |  |
Unrecognized compensation cost, weighted-average recognition period |  |  |  |  |  | 2 years 3 months 18 days |  |
Aggregate weighted-average grant-date fair value of units vested |  |  |  |  |  | $ 15.3 | $ 13.0 | $ 14.9
Performance-Based Unit | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares which will vest after achievement of goals (in shares) | shares |  |  |  |  |  | 0 |  |
Performance-Based Unit | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares which will vest after achievement of goals (in shares) | shares |  |  |  |  |  | 2 |  |

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