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Notes Payable - General Narrative (Details) - Notes and bonds payable $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 31, 2020 GBP (£)
Debt
Unamortized net original issuance premiums	$ 11.8	$ 14.6
Deferred financing costs	$ 45.7	$ 49.2
Weighted average interest rate (as a percent)	3.40%
Weighted average remaining years until maturity	8 years 8 months 12 days
1.625% notes, issued in October 2020 and due in December 2030
Debt
Face amount of notes | £			£ 400,000,000
Stated interest rate (as a percent)	1.625%		1.625%

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- Definition

Weighted average remaining period until maturity of the debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

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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- Definition

Amount, after accumulated amortization, of debt premium.

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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