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Contingencies (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020	Dec. 31, 2020 USD ($)
Contingencies
Number of reporting units | segment			4
Cayman Water Retail Operations, Percentage Of Revenue	32.00%	28.00%	33.00%	32.00%
Cayman Water Retail Operations, Percentage Of Gross Profit	44.00%	39.00%	47.00%	45.00%
WSC [Member]
Contingencies
Accounts Receivable, Net	$ 21.4		$ 21.4		$ 16.8
Payments in accounts receivable	$ 6.9		$ 15.6

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- Definition

Represents the percentage of consolidated gross profit from Cayman Water retail operations.

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- Definition

Represents the percentage of consolidated revenue from Cayman Water retail operations.

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

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- Definition

The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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