Debt and Financing (Tables)

12 Months Ended

Dec. 31, 2023

Debt Instruments [Abstract]

Schedule of Long-term Debt

The following table summarizes the Company's total debt (in millions, except percentages):

				As of December 31,
	Maturity Date	Effective Interest Rates		2023		2022
Senior Notes ("Notes"):
1.200% fixed-rate notes	December 2025	1.37	%	$	400.0	$	400.0
3.750% fixed-rate notes	August 2029	3.86	%	500.0		500.0
2.000% fixed-rate notes	December 2030	2.12	%	400.0		400.0
5.950% fixed-rate notes	March 2041	6.03	%	400.0		400.0
Total Notes				1,700.0		1,700.0
Unaccreted discount and debt issuance costs				(9.6)		(11.3)
Hedge accounting fair value adjustments(*)				(73.6)		(87.4)
Total				$	1,616.8	$	1,601.3

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(*)     Represents the fair value adjustments for interest rate swap contracts with an aggregate notional amount of $600.0 million. These contracts convert the fixed interest rates of certain Notes to floating interest rates and are designated as fair value hedges. See Note 4, Derivative Instruments, for a discussion of the Company's interest rate swap contracts.

Schedule of Maturities of Long-term Debt

As of December 31, 2023, the Company's aggregate debt maturities based on outstanding principal were as follows (in millions):

Years Ending December 31,	Amount
2024	$	—
2025	400.0
2026	—
2027	—
2028	—
Thereafter	1,300.0
Total	$	1,700.0