Debt (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Schedule of total debt

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

				As of
	Maturity Date	Effective Interest Rates		June 30, 2021		December 31, 2020
Senior Notes ("Notes"):
4.500% fixed-rate notes ("2024 Notes")	March 2024	4.70	%	$	—	$	265.8
4.350% fixed-rate notes ("2025-I Notes")	June 2025	4.47	%	—		158.0
1.200% fixed-rate notes ("2025-II Notes")	December 2025	1.37	%	400.0		400.0
3.750% fixed-rate notes ("2029 Notes")	August 2029	3.86	%	500.0		500.0
2.000% fixed-rate notes ("2030 Notes")	December 2030	2.12	%	400.0		400.0
5.950% fixed-rate notes ("2041 Notes")	March 2041	6.03	%	400.0		400.0
Total Notes				1,700.0		2,123.8
Unaccreted discount and debt issuance costs				(13.6)		(16.8)
Hedge accounting fair value adjustments(*)				8.0		20.3
Total				$	1,694.4	$	2,127.3

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(*)     Represents the fair value adjustments for interest rate swaps with an aggregate notional amount of $600.0 million. These interest rate swaps convert the fixed interest rates of certain Senior Notes to floating interest rates and are designated as fair value hedges. See Note 5, Derivative Instruments, for a discussion of the Company's interest rate swaps.