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Acquisitions and Discontinued Operations Acquisitions (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 28, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Acquisitions, net of cash acquired |  | $ 284.5 | $ 0.9 |
Goodwill |  | $ 2,287.5 |  | $ 2,072.7
Aquion |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisitions, net of cash acquired | $ 163.4 |  |  |
Goodwill | 93.9 |  |  |
Indefinite-lived trade name intangible assets | 15.7 |  |  |
Definite-lived customer relationships | $ 78.8 |  |  |
Estimated useful life | 15 years |  |  |
Pelican |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisitions, net of cash acquired | $ 121.1 |  |  |
Goodwill | $ 121.0 |  |  |

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