Accrued Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2016	Jan. 31, 2016
Accrued Liabilities
Accrued salaries, vacation and related benefits	$ 24.3	$ 28.7
Accrued commissions	4.7	6.2
Income taxes payable	10.1	11.4
Accrued interest	29.4	11.7
Other accrued liabilities	43.7	57.3
Total accrued liabilities	$ 112.2	$ 115.3