Summary of Significant Accounting Policies - Intangibles (Details) - USD ($) $ in Millions	Jan. 31, 2020	Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 83.6	$ 85.5
Accumulated Amortization	(27.2)	(24.5)
Product Rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	48.9	48.9
Accumulated Amortization	(18.4)	(16.0)
Key Money Deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	32.2	34.1
Accumulated Amortization	(6.3)	(6.0)
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2.5	2.5
Accumulated Amortization	$ (2.5)	$ (2.5)