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Summary of Preliminary Allocation of Fair Value of Assets Acquired and Liabilities Assumed at Date of Acquisition (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 05, 2017 | Dec. 31, 2016 | Aug. 08, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 516.7 |  | $ 491.5 |  | $ 420.9
Aquasana |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash acquired |  |  |  | $ 7.3 |
Property, plant and equipment |  |  |  | 2.7 |
Intangible assets |  |  |  | 30.0 |
Goodwill |  |  |  | 60.4 |
Total assets acquired |  |  |  | 100.4 |
Current liabilities |  |  |  | (7.1) |
Long-term liabilities |  |  |  | (8.2) |
Total liabilities assumed |  |  |  | (15.3) |
Net assets acquired |  |  |  | $ 85.1 |
Hague |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash acquired |  | $ 7.8 |  |  |
Property, plant and equipment |  | 6.9 |  |  |
Intangible assets |  | 12.8 |  |  |
Goodwill |  | 22.2 |  |  |
Total assets acquired |  | 49.7 |  |  |
Current liabilities |  | (5.6) |  |  |
Long-term liabilities |  | (1.0) |  |  |
Total liabilities assumed |  | (6.6) |  |  |
Net assets acquired |  | $ 43.1 |  |  |

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