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Notes Payable - General Narrative (Details) - Notes and bonds payable $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)	Jul. 31, 2021 GBP (£)	Dec. 31, 2020 USD ($)	Oct. 31, 2020 GBP (£)
Debt
Unamortized net original issuance premiums | $	$ 11.7		$ 14.6
Deferred financing costs | $	$ 44.1		$ 49.2
Weighted average interest rate (as a percent)	3.40%
Weighted average remaining years until maturity	8 years 6 months
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%
1.125% notes, issued in July 2021 and due in 2027 | Subsequent event
Debt
Face amount of notes		£ 400,000,000
Stated interest rate (as a percent)		1.125%
1.750% notes, issued in July 2021 and due in 2033 | Subsequent event
Debt
Face amount of notes		£ 350,000,000
Stated interest rate (as a percent)		1.75%

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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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