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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% |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=109223946&loc=SL94080555-108585 + Details
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