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Debt - Long Term Debt Table (Details) $ in Millions, ¥ in Billions	12 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2020 JPY (¥)	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)
Debt Instrument [Line Items]
Long-term debt, gross			$ 891.9	$ 891.8
Less: unamortized discounts and debt issuance costs			(7.8)	(8.4)
Long-term debt, net			884.1	883.4
2012 4.40% Series B Notes, due July 2042
Debt Instrument [Line Items]
Long-term debt, gross			$ 250.0	250.0
Interest rate, stated percentage		4.40%	4.40%
Periodic payment of principal	$ 50.0
2014 3.80% Senior Notes, due October 2024
Debt Instrument [Line Items]
Long-term debt, gross			$ 250.0	250.0
Interest rate, stated percentage		3.80%	3.80%
2014 4.90% Senior Notes, due October 2044
Debt Instrument [Line Items]
Long-term debt, gross			$ 300.0	300.0
Interest rate, stated percentage		4.90%	4.90%
2016 0.78% Senior Notes, due August 2026
Debt Instrument [Line Items]
Long-term debt, gross			$ 91.9	$ 91.8
Interest rate, stated percentage		0.78%	0.78%
Debt, face amount \| ¥		¥ 10.0