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Restructuring and impairment charges (credits) - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018 | May 01, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs expected cash payment |  | $ 1.0 |  | $ 1.0 |
2019 Footprint realignment plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs expected cash payment | $ 1.0 |  | $ 1.7 |  |
Restructuring reserve | 11.8 |  | 11.8 |  |
2019 Footprint realignment plan | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges |  |  |  |  | $ 56.0
2019 Footprint realignment plan | Minimum | Accelerated Depreciation And Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges |  |  |  |  | 36.0
2019 Footprint realignment plan | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges |  |  |  |  | 70.0
2019 Footprint realignment plan | Maximum | Accelerated Depreciation And Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges |  |  |  |  | $ 45.0
2018 Footprint realignment plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs expected cash payment | 0.7 |  | 1.3 |  |
Restructuring reserve | 45.0 |  | 45.0 |  |
Aggregate restructuring charges incurred | 53.9 |  | 53.9 |  |
Restructuring expenses |  |  | 5.4 |  |
2018 Footprint realignment plan | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges | 102.0 |  | 102.0 |  |
2018 Footprint realignment plan | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges | 133.0 |  | 133.0 |  |
2014 Footprint realignment plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring reserve | 3.8 |  | 3.8 |  |
Aggregate restructuring charges incurred | 12.8 |  | 12.8 |  |
Restructuring expenses |  |  | 30.5 |  |
2014 Footprint realignment plan | Accelerated Depreciation And Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses | 0.7 | $ 0.6 | 1.3 | $ 1.0 |
2014 Footprint realignment plan | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges | 47.0 |  | 47.0 |  |
2014 Footprint realignment plan | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring charges | $ 52.0 |  | $ 52.0 |  |

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