Debt 2017 Senior Notes (Details) € in Thousands, £ in Thousands	Mar. 31, 2026 USD ($)	Mar. 31, 2026 EUR (€)	Mar. 31, 2026 GBP (£)	Mar. 31, 2025 USD ($)	Apr. 01, 2021 USD ($)
Debt Instrument [Line Items]
Long-term Debt	$ 1,812,800,000			$ 1,918,700,000
Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 1,350,000,000
Long-term Debt	557,800,000			674,200,000
STE 4.05% due 2027 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 25,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.55%	3.55%	3.55%
Long-term Debt	$ 25,000,000.0			25,000,000.0
STE 3.45% due 2025 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 125,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.45%	3.45%	3.45%
Long-term Debt	$ 0			125,000,000.0
STE 3.55% due 2027 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 125,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.55%	3.55%	3.55%
Long-term Debt	$ 125,000,000.0			125,000,000.0
STE 3.70% due 2030 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 100,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.70%	3.70%	3.70%
Long-term Debt	$ 100,000,000.0			100,000,000.0
STE 3.93% due 2027 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 50,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.93%	3.93%	3.93%
Long-term Debt	$ 50,000,000.0			50,000,000.0
STE 1.86% due 2027 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| €		€ 60,000
Debt Instrument, Interest Rate, Stated Percentage	1.86%	1.86%	1.86%
Long-term Debt	$ 68,900,000			65,000,000.0
STE 4.03% due 2029 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 45,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.03%	4.03%	4.03%
Long-term Debt	$ 45,000,000.0			45,000,000.0
STE 2.04% due 2029 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| €		€ 20,000
Debt Instrument, Interest Rate, Stated Percentage	2.04%	2.04%	2.04%
Long-term Debt	$ 23,000,000.0			21,700,000
STE 3.04% due 2029 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| £			£ 45,000
Debt Instrument, Interest Rate, Stated Percentage	3.04%	3.04%	3.04%
Long-term Debt	$ 59,500,000			58,200,000
STE 2.30% due 2032 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| €		€ 19,000
Debt Instrument, Interest Rate, Stated Percentage	2.30%	2.30%	2.30%
Long-term Debt	$ 21,800,000			20,600,000
STE 3.17% due 2032 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| £			£ 30,000
Debt Instrument, Interest Rate, Stated Percentage	3.17%	3.17%	3.17%
Long-term Debt	$ 39,700,000			$ 38,800,000