Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The amount of assets reported by an equity method investment of the entity.

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Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Other Investments - Equity Method Investments (Details) - USD ($) $ in Millions		3 Months Ended
	Dec. 31, 2027	Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investment in certain limited partnerships		$ 13.8	$ 13.4
Investment in partnership interests		0.3
Distribution received related to partnerships		0.9
Income related to partnerships		$ 1.0
Scenario, Forecast
Schedule of Equity Method Investments [Line Items]
Investment in partnership interests	$ 2.4
Minimum
Schedule of Equity Method Investments [Line Items]
Partnership interest (as a percentage)		3.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Partnership interest (as a percentage)		5.00%