Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 39.1	$ 38.4
Translation	(0.4)	0.7
Goodwill, ending balance	38.7	39.1
Americas
Goodwill [Roll Forward]
Goodwill, beginning balance	12.2	12.1
Translation	(0.1)	0.1
Goodwill, ending balance	12.1	12.2
Asia-Pacific
Goodwill [Roll Forward]
Goodwill, beginning balance	0.3	0.3
Translation	0.0	0.0
Goodwill, ending balance	0.3	0.3
Japan
Goodwill [Roll Forward]
Goodwill, beginning balance	1.0	1.0
Translation	0.0	0.0
Goodwill, ending balance	1.0	1.0
Europe
Goodwill [Roll Forward]
Goodwill, beginning balance	1.1	1.1
Translation	0.0	0.0
Goodwill, ending balance	1.1	1.1
Other
Goodwill [Roll Forward]
Goodwill, beginning balance	24.5	23.9
Translation	(0.3)	0.6
Goodwill, ending balance	$ 24.2	$ 24.5