Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2017	Jan. 31, 2016	Dec. 31, 2014
Allowance for doubtful accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance At Beginning Of Period	$ 8.1	$ 11.3	$ 8.0	$ 6.0
Expenses	0.1	4.0	4.1	12.4
Other				0.2
Write- Offs/ Disposals	0.2	1.8	0.8	10.5
Balance At End Of Period	8.0	13.5	11.3	8.1
Reserve for obsolete inventories
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance At Beginning Of Period	33.0	40.4	33.5	30.3
Expenses	0.7	20.7	7.7	4.6
Write- Offs/ Disposals	0.2	1.5	0.8	1.9
Balance At End Of Period	33.5	59.6	40.4	33.0
Deferred tax asset valuation allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance At Beginning Of Period	24.8	21.9	24.8	12.8
Other		(1.6)	5.3	12.0
Write- Offs/ Disposals		(2.5)	(8.2)
Balance At End Of Period	$ 24.8	$ 17.8	$ 21.9	$ 24.8