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Long-Term Debt - Fair Value - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024	Feb. 29, 2024
6.375% 2034 notes
Debt Instrument [Line Items]
Private offered aggregate principal amount rate	6.375%	6.375%	6.375%
6.375% 2034 notes | Level 2
Debt Instrument [Line Items]
Fair value of long term debt	$ 1,000.0
5.00% 2030 notes
Debt Instrument [Line Items]
Private offered aggregate principal amount rate	5.00%
5.00% 2030 notes | Level 2
Debt Instrument [Line Items]
Fair value of long term debt	$ 540.8
4.25% 2032 notes
Debt Instrument [Line Items]
Private offered aggregate principal amount rate	4.25%
4.25% 2032 notes | Level 2
Debt Instrument [Line Items]
Fair value of long term debt	$ 1,200.0
6.375% 2032 notes
Debt Instrument [Line Items]
Private offered aggregate principal amount rate	6.375%
6.375% 2032 notes | Level 2
Debt Instrument [Line Items]
Fair value of long term debt	$ 727.3

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