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Accounting Policies - Intangible assets (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2015 | Oct. 02, 2016 | Sep. 27, 2015 | Oct. 02, 2016 | Sep. 27, 2015 | Dec. 31, 2015
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  | $ 302.2 |  | $ 302.2 |  | $ 301.2
Accumulated Amortization |  | (160.0) |  | (160.0) |  | (144.6)
Net Carrying Amount |  | 142.2 |  | 142.2 |  | 156.6
Indefinite-lived intangible assets |  |  |  |  |  |
Indefinite-lived intangible assets |  | 36.7 |  | 36.7 |  | 36.2
Intangible assets |  |  |  |  |  |
Gross Carrying Amount |  | 338.9 |  | 338.9 |  | 337.4
Net Carrying Amount |  | 178.9 |  | $ 178.9 |  | 192.8
Weighted-average amortization |  |  |  | 11 years |  |
Aggregate amortization expense for amortized intangible assets |  | 5.1 | $ 5.6 | $ 15.3 | $ 15.9 |
Amortization expense |  |  |  |  |  |
Remainder of 2016 |  | 5.0 |  | 5.0 |  |
2017 |  | 19.5 |  | 19.5 |  |
2018 |  | 16.6 |  | 16.6 |  |
2019 |  | 12.6 |  | 12.6 |  |
2020 |  | 12.2 |  | 12.2 |  |
Aerco Korea |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Net Carrying Amount |  | 1.6 |  | 1.6 |  |
Patents |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  | 16.1 |  | 16.1 |  | 16.1
Accumulated Amortization |  | (14.7) |  | (14.7) |  | (14.1)
Net Carrying Amount |  | 1.4 |  | $ 1.4 |  | 2.0
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 3 years 8 months 12 days |  |
Customer relationships |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  | 215.4 |  | $ 215.4 |  | 212.5
Accumulated Amortization |  | (113.3) |  | (113.3) |  | (102.1)
Net Carrying Amount |  | 102.1 |  | $ 102.1 |  | 110.4
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 11 years 1 month 6 days |  |
Customer relationships | Apex |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Weighted-average amortization | 10 years |  |  |  |  |
Customer relationships | Aerco Korea |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 10 years |  |
Technology |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  | 41.6 |  | $ 41.6 |  | 41.3
Accumulated Amortization |  | (18.3) |  | (18.3) |  | (16.1)
Net Carrying Amount |  | 23.3 |  | $ 23.3 |  | 25.2
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 8 years 10 months 24 days |  |
Trade name |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  | 22.2 |  | $ 22.2 |  | 21.9
Accumulated Amortization |  | (7.7) |  | (7.7) |  | (6.4)
Net Carrying Amount |  | 14.5 |  | $ 14.5 |  | 15.5
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 14 years 1 month 6 days |  |
Trade name | Apex |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Weighted-average amortization | 15 years |  |  |  |  |
Other |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  | 6.9 |  | $ 6.9 |  | 9.4
Accumulated Amortization |  | (6.0) |  | (6.0) |  | (5.9)
Net Carrying Amount |  | $ 0.9 |  | $ 0.9 |  | $ 3.5
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 20 years 2 months 12 days |  |

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