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Accounting Policies - Intangible assets (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 02, 2016 | Feb. 26, 2016 | Nov. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  |  |  | $ 332.6 | $ 301.2 |
Accumulated Amortization |  |  |  | (165.4) | (144.6) |
Net Carrying Amount |  |  |  | 167.2 | 156.6 |
Indefinite-lived intangible assets |  |  |  |  |  |
Indefinite-lived intangible assets |  |  |  | 35.3 | 36.2 |
Intangible assets |  |  |  |  |  |
Gross Carrying Amount |  |  |  | 367.9 | 337.4 |
Net Carrying Amount |  |  |  | $ 202.5 | 192.8 |
Weighted-average amortization |  |  |  | 11 years 6 months |  |
Indefinite-lived intangible asset impairment |  |  |  | $ 0.4 | 0.6 | $ 1.3
Aggregate amortization expense for amortized intangible assets |  |  |  | 20.8 | 20.9 | 15.2
Amortization expense |  |  |  |  |  |
2017 |  |  |  | 21.6 |  |
2018 |  |  |  | 18.4 |  |
2019 |  |  |  | 14.8 |  |
2020 |  |  |  | 14.4 |  |
2021 |  |  |  | 12.7 |  |
PVI Riverside Holdings, Inc Member |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Net Carrying Amount |  |  |  | $ 31.0 |  |
Weighted-average amortization |  |  |  | 16 years 1 month 6 days |  |
Apex |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Net Carrying Amount |  |  |  |  | $ 10.1 |
Weighted-average amortization |  |  |  |  | 13 years |
EMEA | Trade name |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Indefinite-lived intangible asset impairment |  |  |  | $ 0.4 |  |
Patents |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  |  |  | 16.1 | $ 16.1 |
Accumulated Amortization |  |  |  | (14.9) | (14.1) |
Net Carrying Amount |  |  |  | $ 1.2 | 2.0 |
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 3 years 7 months 6 days |  |
Customer relationships |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  |  |  | $ 231.5 | 212.5 |
Accumulated Amortization |  |  |  | (117.3) | (102.1) |
Net Carrying Amount |  |  |  | $ 114.2 | 110.4 |
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 11 years 8 months 12 days |  |
Customer relationships | PVI Riverside Holdings, Inc Member |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Net Carrying Amount |  |  |  | $ 17.6 |  |
Weighted-average amortization | 15 years |  |  | 15 years |  |
Customer relationships | Apex |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  | $ 8.4 |
Weighted-average amortization |  |  | 10 years |  | 10 years |
Customer relationships | Aerco Korea |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Net Carrying Amount |  |  |  | $ 1.6 |  |
Weighted-average amortization |  | 10 years |  | 10 years |  |
Technology |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  |  |  | $ 53.1 | $ 41.3 |
Accumulated Amortization |  |  |  | (19.2) | (16.1) |
Net Carrying Amount |  |  |  | $ 33.9 | 25.2 |
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 9 years 1 month 6 days |  |
Technology | PVI Riverside Holdings, Inc Member |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Net Carrying Amount |  |  |  | $ 10.2 |  |
Weighted-average amortization | 10 years |  |  | 10 years |  |
Trade name |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  |  |  | $ 25.1 | 21.9 |
Accumulated Amortization |  |  |  | (8.1) | (6.4) |
Net Carrying Amount |  |  |  | $ 17.0 | 15.5 |
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 15 years 1 month 6 days |  |
Trade name | PVI Riverside Holdings, Inc Member |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Gross Carrying Amount |  |  |  | $ 3.2 |  |
Weighted-average amortization | 20 years |  |  | 20 years |  |
Trade name | Apex |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  | $ 1.7 |
Weighted-average amortization |  |  | 15 years |  | 15 years |
Trade name | Americas |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Indefinite-lived intangible asset impairment |  |  |  |  | $ 0.5 | 0.5
Trade name | EMEA |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Indefinite-lived intangible asset impairment |  |  |  |  | 0.1 | $ 0.8
Other |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Carrying Amount |  |  |  | $ 6.8 | 9.4 |
Accumulated Amortization |  |  |  | (5.9) | (5.9) |
Net Carrying Amount |  |  |  | $ 0.9 | $ 3.5 |
Intangible assets |  |  |  |  |  |
Weighted-average amortization |  |  |  | 19 years 8 months 12 days |  |

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