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Borrowing Arrangements (Tables)
 12 Months Ended
Jan. 31, 2022
Debt Disclosure [Abstract]  
Fair Value of Market Price Based on the quoted market prices, the approximate fair value of the notes as of January 31, 2022, were as follows:
Aggregate Principal AmountFair value
2012 Notes$350.0 $355.8 
2015 Notes300.0 320.4 
2017 Notes500.0 525.8 
2020 Notes500.0 503.3 
2021 Notes1,000.0 956.7 
Future Minimum Payments For Borrowings
The expected future principal payments for all borrowings as of January 31, 2022, were as follows:
Fiscal year ending
2023$350.0 
2024— 
2025— 
2026300.0 
2027— 
Thereafter2,000.0 
Total principal outstanding$2,650.0