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Goodwill and Intangibles - Intangibles (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Intangible assets subject to amortization |  |  |  |  |
Gross Carrying Amount |  | $ 335.6 | $ 335.6 | $ 332.6 |
Accumulated Amortization |  | (187.7) | (187.7) | (165.4) |
Net Carrying Amount |  | 147.9 | 147.9 | 167.2 |
Indefinite-lived intangible assets |  |  |  |  |
Indefinite-lived intangible assets |  | 37.3 | 37.3 | 35.3 |
Intangible assets |  |  |  |  |
Gross Carrying Amount |  | 372.9 | 372.9 | 367.9 |
Net Carrying Amount |  | 185.2 | 185.2 | 202.5 |
Indefinite-lived intangible asset impairment |  |  | $ 0.4 | 0.6 |
Estimated useful lives |  |  | 12 years 6 months |  |
Aggregate amortization expense for amortized intangible assets |  |  | $ 22.5 | 20.8 | $ 20.9
Amortization expense |  |  |  |  |
2018 |  | 19.5 | 19.5 |  |
2019 |  | 15.5 | 15.5 |  |
2020 |  | 15.0 | 15.0 |  |
2021 |  | 13.3 | 13.3 |  |
2022 |  | 11.6 | 11.6 |  |
Patents |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Gross Carrying Amount |  | 16.1 | 16.1 | 16.1 |
Accumulated Amortization |  | (15.4) | (15.4) | (14.9) |
Net Carrying Amount |  | 0.7 | $ 0.7 | 1.2 |
Intangible assets |  |  |  |  |
Estimated useful lives |  |  | 3 years 3 months 18 days |  |
Customer relationships |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Gross Carrying Amount |  | 233.2 | $ 233.2 | 231.5 |
Accumulated Amortization |  | (133.5) | (133.5) | (117.3) |
Net Carrying Amount |  | 99.7 | $ 99.7 | 114.2 |
Intangible assets |  |  |  |  |
Estimated useful lives |  |  | 11 years 3 months 18 days |  |
Technology |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Gross Carrying Amount |  | 53.9 | $ 53.9 | 53.1 |
Accumulated Amortization |  | (23.1) | (23.1) | (19.2) |
Net Carrying Amount |  | 30.8 | $ 30.8 | 33.9 |
Intangible assets |  |  |  |  |
Estimated useful lives |  |  | 8 years 1 month 6 days |  |
Trade name |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Gross Carrying Amount |  | 25.5 | $ 25.5 | 25.1 |
Accumulated Amortization |  | (9.7) | (9.7) | (8.1) |
Net Carrying Amount |  | 15.8 | $ 15.8 | 17.0 |
Intangible assets |  |  |  |  |
Estimated useful lives |  |  | 14 years 4 months 24 days |  |
Other |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Gross Carrying Amount |  | 6.9 | $ 6.9 | 6.8 |
Accumulated Amortization |  | (6.0) | (6.0) | (5.9) |
Net Carrying Amount |  | 0.9 | $ 0.9 | 0.9 |
Intangible assets |  |  |  |  |
Estimated useful lives |  |  | 19 years 8 months 12 days |  |
Americas | Technology |  |  |  |  |
Intangible assets |  |  |  |  |
Finite-lived intangible asset impairment |  | 1.0 |  |  |
PVI Riverside Holdings, Inc Member |  |  |  |  |
Intangible assets |  |  |  |  |
Net Carrying Amount |  | 31.0 | $ 31.0 |  |
Estimated useful lives |  |  | 16 years 1 month 6 days |  |
PVI Riverside Holdings, Inc Member | Customer relationships |  |  |  |  |
Intangible assets |  |  |  |  |
Net Carrying Amount |  | 17.6 | $ 17.6 |  |
Estimated useful lives | 15 years |  | 15 years |  |
PVI Riverside Holdings, Inc Member | Technology |  |  |  |  |
Intangible assets |  |  |  |  |
Net Carrying Amount |  | 10.2 | $ 10.2 |  |
Estimated useful lives | 10 years |  | 10 years |  |
PVI Riverside Holdings, Inc Member | Trade name |  |  |  |  |
Intangible assets |  |  |  |  |
Gross Carrying Amount |  | $ 3.2 | $ 3.2 |  |
Estimated useful lives | 20 years |  | 20 years |  |
Watts Korea | Customer relationships |  |  |  |  |
Intangible assets |  |  |  |  |
Net Carrying Amount |  |  |  | $ 1.6 |
Estimated useful lives |  |  |  | 10 years |
Europe | Trade name |  |  |  |  |
Intangible assets |  |  |  |  |
Indefinite-lived intangible asset impairment |  |  |  | $ 0.4 |
Europe | Europe | Trade name |  |  |  |  |
Intangible assets |  |  |  |  |
Indefinite-lived intangible asset impairment |  |  |  |  | 0.1
Americas | Trade name |  |  |  |  |
Intangible assets |  |  |  |  |
Indefinite-lived intangible asset impairment |  |  |  |  | $ 0.5

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