Investments In Unconsolidated Subsidiaries, Fair Value

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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The total fair value for all investments, comprising or included in the major category, of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) for which the entity has intentions to sell or liquidate, but the specific assets for sale or liquidation have not been identified (for example, the entity intends to sell $10,000,000 of its investments in private equity funds, but the individual investments to be sold have not been identified).

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Amount after accumulated amortization of finite-lived and indefinite-lived intangible assets classified as other.

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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in unconsolidated subsidiaries, fair value	$ 351.8		$ 351.8		$ 352.3
Asset impairments	0.0	$ 0.0	0.0	$ 0.0
Total long-term debt	3,310.0		3,310.0		2,824.0
Fair Value Measured at Net Asset Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments In Unconsolidated Subsidiaries, Fair Value					19.2
Fair Value Measured at Net Asset Value \| Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments In Unconsolidated Subsidiaries, Fair Value	19.6		19.6
2.500% Senior Notes \| Carrying Value \| Mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	47.7		47.7		36.3
Non-Marketable Equity Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital investments	$ 142.8		$ 142.8		$ 142.8