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Commitments, Contingencies and Off-Balance Sheet Arrangements - Contractual Obligations (Detail) $ in Millions	Jun. 30, 2025 USD ($)
Senior Notes
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	$ 0.0
Contractual Obligations, Payments Due by Period, 2026	0.0
Contractual Obligations, Payments Due by Period, 2027	750.0
Contractual Obligations, Payments Due by Period, 2028	0.0
Contractual Obligations, Payments Due by Period, 2029	750.0
Contractual Obligations, Payments Due by Period, Thereafter	8,050.0
Contractual Obligations, Payments Due by Period, Total	9,550.0
Note Purchase Agreements
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	0.0
Contractual Obligations, Payments Due by Period, 2026	640.0
Contractual Obligations, Payments Due by Period, 2027	478.0
Contractual Obligations, Payments Due by Period, 2028	200.0
Contractual Obligations, Payments Due by Period, 2029	350.0
Contractual Obligations, Payments Due by Period, Thereafter	1,655.0
Contractual Obligations, Payments Due by Period, Total	3,323.0
Credit Agreement
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	0.0
Contractual Obligations, Payments Due by Period, 2026	0.0
Contractual Obligations, Payments Due by Period, 2027	0.0
Contractual Obligations, Payments Due by Period, 2028	0.0
Contractual Obligations, Payments Due by Period, 2029	0.0
Contractual Obligations, Payments Due by Period, Thereafter	0.0
Contractual Obligations, Payments Due by Period, Total	0.0
Premium Financing Debt Facility
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	157.2
Contractual Obligations, Payments Due by Period, 2026	0.0
Contractual Obligations, Payments Due by Period, 2027	0.0
Contractual Obligations, Payments Due by Period, 2028	0.0
Contractual Obligations, Payments Due by Period, 2029	0.0
Contractual Obligations, Payments Due by Period, Thereafter	0.0
Contractual Obligations, Payments Due by Period, Total	157.2
Interest on debt
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	342.9
Contractual Obligations, Payments Due by Period, 2026	611.5
Contractual Obligations, Payments Due by Period, 2027	593.0
Contractual Obligations, Payments Due by Period, 2028	539.2
Contractual Obligations, Payments Due by Period, 2029	528.5
Contractual Obligations, Payments Due by Period, Thereafter	6,589.4
Contractual Obligations, Payments Due by Period, Total	9,204.5
Total debt obligations
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	500.1
Contractual Obligations, Payments Due by Period, 2026	1,251.5
Contractual Obligations, Payments Due by Period, 2027	1,821.0
Contractual Obligations, Payments Due by Period, 2028	739.2
Contractual Obligations, Payments Due by Period, 2029	1,628.5
Contractual Obligations, Payments Due by Period, Thereafter	16,294.4
Contractual Obligations, Payments Due by Period, Total	22,234.7
Operating lease obligations
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	61.2
Contractual Obligations, Payments Due by Period, 2026	122.6
Contractual Obligations, Payments Due by Period, 2027	99.9
Contractual Obligations, Payments Due by Period, 2028	71.3
Contractual Obligations, Payments Due by Period, 2029	52.7
Contractual Obligations, Payments Due by Period, Thereafter	176.2
Contractual Obligations, Payments Due by Period, Total	583.9
Less sublease arrangements
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, Thereafter	0.0
Contractual Obligations, Sublease Arrangement, 2025	(1.2)
Contractual Obligations, Sublease Arrangement, 2026	(2.2)
Contractual Obligations, Sublease Arrangement, 2027	(1.9)
Contractual Obligations, Sublease Arrangement, 2028	(1.3)
Contractual Obligations, Sublease Arrangement, 2029	(1.0)
Contractual Obligations, Sublease Arrangement, Total	(7.6)
Outstanding purchase obligations
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	167.9
Contractual Obligations, Payments Due by Period, 2026	197.1
Contractual Obligations, Payments Due by Period, 2027	156.0
Contractual Obligations, Payments Due by Period, 2028	40.2
Contractual Obligations, Payments Due by Period, 2029	26.8
Contractual Obligations, Payments Due by Period, Thereafter	54.3
Contractual Obligations, Payments Due by Period, Total	642.3
Total contractual obligations
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	728.0
Contractual Obligations, Payments Due by Period, 2026	1,569.0
Contractual Obligations, Payments Due by Period, 2027	2,075.0
Contractual Obligations, Payments Due by Period, 2028	849.4
Contractual Obligations, Payments Due by Period, 2029	1,707.0
Contractual Obligations, Payments Due by Period, Thereafter	16,524.9
Contractual Obligations, Payments Due by Period, Total	$ 23,453.3

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Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]

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Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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