Consolidated and Combined Statements Of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Common Stock	Additional Paid-in Capital	Treasury Stock	Former Parent Company Investment	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2013				$ 2,750.5		$ 48.2	$ 2,798.7
Net transfers from Former Parent				(189.8)			(189.8)
Net earnings before spin-off				83.9			83.9
Net earnings after spin-off					$ 4.2		4.2
Consummation of spin-off transaction on December 16, 2014	$ 0.5	$ 2,644.1		$ (2,644.6)
Consummation of spin-off transaction on December 16, 2014 (in shares)	52.5
Net earnings (loss)							88.1
Net foreign currency translation adjustments						(76.7)	(76.7)
Balance at Dec. 31, 2014	$ 0.5	2,644.1			4.2	(28.5)	2,620.3
Balance (shares) at Dec. 31, 2014	52.5
Stock option expense		0.2					0.2
Restricted stock grants, net of forfeitures and restricted stock unit vesting		0.5					0.5
Restricted stock grants, net of forfeitures and restricted stock unit vesting (in shares)	0.3
Net earnings (loss)					7.1		7.1
Net foreign currency translation adjustments						(27.0)	(27.0)
Balance at Jan. 31, 2015	$ 0.5	2,644.8			11.3	(55.5)	2,601.1
Balance (shares) at Jan. 31, 2015	52.8
Sale of stock under employee stock purchase plan		1.8					1.8
Purchase of treasury stock			$ (12.5)				(12.5)
Restricted stock grants, net of forfeitures and restricted stock unit vesting		14.8			0.8		15.6
Restricted stock grants, net of forfeitures and restricted stock unit vesting (in shares)	0.5
Net earnings (loss)					(385.8)		(385.8)
Return to provision true-up related to pre spin-off and other		1.0					1.0
Net foreign currency translation adjustments						(18.7)	(18.7)
Balance at Jan. 31, 2016	$ 0.5	2,662.4	(12.5)		(373.7)	(74.2)	2,202.5
Balance (shares) at Jan. 31, 2016	53.3
Net earnings (loss)							2.5
Balance at Apr. 30, 2016							2,230.4
Balance at Jan. 31, 2016	$ 0.5	2,662.4	(12.5)		(373.7)	(74.2)	2,202.5
Balance (shares) at Jan. 31, 2016	53.3
Sale of stock under employee stock purchase plan		2.0					2.0
Purchase of treasury stock			(41.9)				(41.9)
Restricted stock grants, net of forfeitures and restricted stock unit vesting		22.1			(2.5)		19.6
Restricted stock grants, net of forfeitures and restricted stock unit vesting (in shares)	0.2
Net earnings (loss)					48.2		48.2
Net foreign currency translation adjustments						(9.3)	(9.3)
Balance at Jan. 31, 2017	$ 0.5	$ 2,686.5	$ (54.4)		$ (328.0)	$ (83.5)	2,221.1
Balance (shares) at Jan. 31, 2017	53.5
Balance at Apr. 30, 2016							2,230.4
Net earnings (loss)							8.0
Balance at Jul. 31, 2016							$ 2,223.0