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Goodwill and Intangibles - Goodwill (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Oct. 29, 2017 USD ($)
Gross Balance |  |  |  |  |
Balance at the beginning of the period |  | $ 699,800,000 | $ 656,100,000 |  |
Acquired During the Period |  | 2,000,000 | 47,000,000 |  |
Foreign Currency Translation and Other |  | 15,800,000 | (3,300,000) |  |
Balance at the end of the period | $ 656,100,000 | 717,600,000 | 699,800,000 | $ 656,100,000 |
Accumulated Impairment Losses |  |  |  |  |
Balance at the beginning of the period |  | (167,100,000) | (167,100,000) |  |
Balance at the end of the period | (167,100,000) | (167,100,000) | (167,100,000) | (167,100,000) |
Net Goodwill |  | $ 550,500,000 | 532,700,000 |  | $ 547,500,000
Number of reporting units | item |  | 8 |  |  |
Number of geographic segments | item |  | 3 |  |  |
Number of operating units that were combined |  | $ 2 |  |  |
Percentage of fair value of reporting unit in excess of carrying amount. |  |  |  |  | 6.00%
Americas |  |  |  |  |
Gross Balance |  |  |  |  |
Balance at the beginning of the period |  | 434,700,000 | 391,200,000 |  |
Acquired During the Period |  |  | 43,300,000 |  |
Foreign Currency Translation and Other |  |  | 200,000 |  |
Balance at the end of the period | 391,200,000 |  | 434,700,000 | 391,200,000 |
Accumulated Impairment Losses |  |  |  |  |
Balance at the beginning of the period |  | (24,500,000) | (24,500,000) |  |
Balance at the end of the period | (24,500,000) |  | (24,500,000) | (24,500,000) |
Net Goodwill |  |  | 410,200,000 |  |
Europe |  |  |  |  |
Gross Balance |  |  |  |  |
Balance at the beginning of the period |  | 234,900,000 | 238,600,000 |  |
Foreign Currency Translation and Other |  |  | (3,700,000) |  |
Balance at the end of the period | 238,600,000 |  | 234,900,000 | 238,600,000 |
Accumulated Impairment Losses |  |  |  |  |
Balance at the beginning of the period |  | (129,700,000) | (129,700,000) |  |
Balance at the end of the period | (129,700,000) |  | (129,700,000) | (129,700,000) |
Net Goodwill |  |  | 105,200,000 |  |
Americas |  |  |  |  |
Gross Balance |  |  |  |  |
Balance at the beginning of the period |  | 434,700,000 |  |  |
Acquired During the Period |  | 2,000,000 |  |  |
Foreign Currency Translation and Other |  | 700,000 |  |  |
Balance at the end of the period |  | 437,400,000 | 434,700,000 |  |
Accumulated Impairment Losses |  |  |  |  |
Balance at the beginning of the period |  | (24,500,000) |  |  |
Balance at the end of the period |  | (24,500,000) | (24,500,000) |  |
Net Goodwill |  | 412,900,000 |  |  |
Europe |  |  |  |  |
Gross Balance |  |  |  |  |
Balance at the beginning of the period |  | 234,900,000 |  |  |
Foreign Currency Translation and Other |  | 14,400,000 |  |  |
Balance at the end of the period |  | 249,300,000 | 234,900,000 |  |
Accumulated Impairment Losses |  |  |  |  |
Balance at the beginning of the period |  | (129,700,000) |  |  |
Balance at the end of the period |  | (129,700,000) | (129,700,000) |  |
Goodwill impairment charges | 129,700,000 |  |  | 129,700,000 |
Net Goodwill |  | 119,600,000 |  |  |
Goodwill impairment charges | 129,700,000 |  |  | 129,700,000 |
Tax benefit on Impairment charge | 3,400,000 |  |  |  |
Net impairment charge | 126,300,000 |  |  |  |
APMEA |  |  |  |  |
Gross Balance |  |  |  |  |
Balance at the beginning of the period |  | 30,200,000 | 26,300,000 |  |
Acquired During the Period |  |  | 3,700,000 |  |
Foreign Currency Translation and Other |  | 700,000 | 200,000 |  |
Balance at the end of the period | 26,300,000 | 30,900,000 | 30,200,000 | 26,300,000 |
Accumulated Impairment Losses |  |  |  |  |
Balance at the beginning of the period |  | (12,900,000) | (12,900,000) |  |
Balance at the end of the period | $ (12,900,000) | (12,900,000) | (12,900,000) | $ (12,900,000) |
Net Goodwill |  | 18,000,000 | $ 17,300,000 |  |
Water quality |  |  |  |  |
Accumulated Impairment Losses |  |  |  |  |
Net Goodwill |  | $ 0 |  |  |

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