Accrued Liabilities (Details) - USD ($) $ in Millions	Oct. 31, 2016	Jan. 31, 2016
Accrued Liabilities
Accrued salaries, vacation and related benefits	$ 30.1	$ 28.7
Accrued commissions	7.5	6.2
Income taxes payable	4.3	11.4
Accrued interest	29.4	11.7
Other accrued liabilities	38.0	57.3
Total accrued liabilities	$ 109.3	$ 115.3