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Acquisitions - U.S. Water Services (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 11 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2015 | Mar. 31, 2015 | Sep. 30, 2016 | Dec. 31, 2015
Assets Acquired [Abstract] |  |  |  |  |
Goodwill |  |  |  | $ 130.6 | $ 130.6
Liabilities Assumed [Abstract] |  |  |  |  |
Restricted Cash - Current | [1] |  |  | $ 7.0 | $ 5.6
U.S. Water Services [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Name of Acquired Entity |  | U.S. Water Services |  |  |
Total Consideration |  | $ 202.3 |  |  |
Payments to Acquire Business |  | 166.6 |  |  |
Contingent Consideration |  | $ 35.7 |  |  |
Percent of Results of Operations Reflected in Income Statement |  |  |  | 100.00% | 100.00%
Percentage of Voting Interests Acquired |  | 100.00% |  |  |
Assets Acquired [Abstract] |  |  |  |  |
Cash and Cash Equivalents |  | $ 0.9 |  |  |
Accounts Receivable |  | 16.8 |  |  |
Inventories | [2] | 13.4 |  |  |
Other Current Assets | [3] | 5.3 |  |  |
Property, Plant and Equipment |  | 10.6 |  |  |
Intangible Assets | [4] | 83.0 |  |  |
Goodwill | [5] | 122.9 |  |  |
Other Non-Current Assets |  | 0.2 |  |  |
Total Assets Acquired |  | 253.1 |  |  |
Liabilities Assumed [Abstract] |  |  |  |  |
Current Liabilities |  | 19.2 |  |  |
Non-Current Liabilities |  | 31.6 |  |  |
Total Liabilities Assumed |  | 50.8 |  |  |
Net Identifiable Assets Acquired |  | 202.3 |  |  |
Fair Value Adjustments for Work in Progress and Finished Goods |  | 2.7 |  |  |
Fair Value of Sales Backlog |  | 1.6 |  |  |
Restricted Cash - Current |  | 2.1 |  |  |
Tax Deductible Goodwill |  | $ 2.9 |  |  |
Acquisition Related Costs |  |  | $ 3.0 |  |
[1] | Restricted Cash includes collateral deposits required under ALLETE Clean Energy’s loan agreements and cash pledged as collateral for U.S. Water Services’ standby letters of credit.
[2] | Included in Inventories was $2.7 million of fair value adjustments relating to work in progress and finished goods inventories which were recognized as Cost of Sales within one year from the acquisition date.
[3] | Included in Other Current Assets was $1.6 million relating to the fair value of sales backlog. Sales backlog was recognized as Cost of Sales within one year from the acquisition date. Also included in Other Current Assets was restricted cash of $2.1 million relating to cash pledged as collateral for standby letters of credit.
[4] | Intangible Assets include customer relationships, patents, non-compete agreements, and trademarks and trade names. (See Note 4. Goodwill and Intangible Assets.)
[5] | For tax purposes, the purchase price allocation resulted in $2.9 million of deductible goodwill.

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