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Debt - Schedule of Outstanding Debt (Details) - USD ($) $ in Millions	May 02, 2026	Apr. 15, 2026	Jan. 31, 2026
Debt Instrument [Line Items]
Total borrowings	$ 4,999.9		$ 4,499.9
Less: Unamortized debt discount and issuance cost	(38.6)		(29.3)
Net carrying amount of debt	4,961.3		4,470.6
Less: Current portion	0.0		499.8
Non-current portion	$ 4,961.3		$ 3,970.8
Short-term debt, weighted average interest rate (as a percent)			1.65%
Senior Notes \| 4.875% MTG/MTI 2028 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.875%
Total borrowings	$ 499.9		$ 499.9
Senior Notes \| MTG 2028 Senior Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)	4.94%
Senior Notes \| MTI 2028 Senior Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)	4.988%
Senior Notes \| 1.650% 2026 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	1.65%
Effective interest rate (as a percent)	1.839%
Total borrowings	$ 0.0		500.0
Senior Notes \| 2.450% 2028 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	2.45%
Effective interest rate (as a percent)	2.554%
Total borrowings	$ 750.0		750.0
Senior Notes \| 5.750% 2029 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.75%
Effective interest rate (as a percent)	5.891%
Total borrowings	$ 500.0		500.0
Senior Notes \| 4.750% 2030 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.75%
Effective interest rate (as a percent)	4.88%
Total borrowings	$ 500.0		500.0
Senior Notes \| 2.950% 2031 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	2.95%
Effective interest rate (as a percent)	3.043%
Total borrowings	$ 750.0		750.0
Senior Notes \| 5.950% 2033 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.95%
Effective interest rate (as a percent)	6.082%
Total borrowings	$ 500.0		500.0
Senior Notes \| 5.450% 2035 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.45%
Effective interest rate (as a percent)	5.531%
Total borrowings	$ 500.0		500.0
Senior Notes \| 5.300% 2036 Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.30%	5.30%
Effective interest rate (as a percent)	5.358%	5.358%
Total borrowings	$ 1,000.0		$ 0.0
Net carrying amount of debt	$ 1,000.0