Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Millions, $ in Millions		Total		Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact due to adoption of ASU 2018-02	[1]					$ 3.2	$ (3.2)
Beginning balance (in shares) at Dec. 31, 2018				141.7
Beginning balance at Dec. 31, 2018		$ 1,191.7		$ 1.4	$ 2,325.0	(761.5)	(373.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(47.6)				(47.6)
Foreign currency translation adjustment		19.8					19.8
Pension and other postretirement benefits adjustment		(0.1)
Derivative financial instruments, net of tax		(24.2)					(24.2)
Common stock issued for the Nexeo acquisition (in shares)				27.9
Common stock issued for the Nexeo acquisition		649.3	[2]	$ 0.3	649.0
Shares cancelled (in shares)				(1.5)
Shares cancelled		(35.5)			(35.5)
Restricted stock units vested (in shares)				0.3
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)				(0.1)
Tax withholdings related to net share settlements of stock-based compensation awards		(2.8)			(2.8)
Stock option exercises (in shares)				0.3
Stock option exercises		5.7			5.7
Stock-based compensation		17.3			17.3
Employee stock purchase plan		0.6			0.6
Other		0.1			0.1
Ending balance (in shares) at Jun. 30, 2019				168.6
Ending balance at Jun. 30, 2019		1,774.5		$ 1.7	2,959.4	(805.9)	(380.7)
Beginning balance (in shares) at Mar. 31, 2019				169.7
Beginning balance at Mar. 31, 2019		1,781.0		$ 1.7	2,978.0	(822.2)	(376.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		16.3				16.3
Foreign currency translation adjustment		11.6					11.6
Pension and other postretirement benefits adjustment		(0.1)
Derivative financial instruments, net of tax		$ (15.9)					(15.9)
Shares cancelled (in shares)	[2]	(1.5)
Shares cancelled	[2]	$ (35.5)
Restricted stock units vested (in shares)				0.1
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)				0.0
Tax withholdings related to net share settlements of stock-based compensation awards		$ (0.8)			(0.8)
Stock option exercises (in shares)		0.3
Stock option exercises		$ 5.7
Stock-based compensation		11.3			11.3
Employee stock purchase plan		0.6
Other		0.1
Ending balance (in shares) at Jun. 30, 2019				168.6
Ending balance at Jun. 30, 2019		$ 1,774.5		$ 1.7	2,959.4	(805.9)	(380.7)
Beginning balance (in shares) at Dec. 31, 2019		168.7		168.7
Beginning balance at Dec. 31, 2019		$ 1,732.8		$ 1.7	2,968.9	(858.5)	(379.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		57.7				57.7
Foreign currency translation adjustment		(74.4)					(74.4)
Pension and other postretirement benefits adjustment		0.1					0.1
Derivative financial instruments, net of tax		(21.4)					(21.4)
Restricted stock units vested (in shares)				0.3
Restricted stock units vested		0.0
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)				(0.1)
Tax withholdings related to net share settlements of stock-based compensation awards		(1.4)			(1.4)
Stock option exercises (in shares)				0.1
Stock option exercises		0.7			0.7
Stock-based compensation		8.3			8.3
Employee stock purchase plan		0.7
Other		$ 0.1
Ending balance (in shares) at Jun. 30, 2020		169.0		169.0
Ending balance at Jun. 30, 2020		$ 1,703.2		$ 1.7	2,977.3	(800.8)	(475.0)
Beginning balance (in shares) at Mar. 31, 2020				168.9
Beginning balance at Mar. 31, 2020		1,683.6		$ 1.7	2,974.0	(802.6)	(489.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1.8				1.8
Foreign currency translation adjustment		19.7					19.7
Pension and other postretirement benefits adjustment		0.1
Derivative financial instruments, net of tax		(5.3)					(5.3)
Restricted stock units vested (in shares)				0.1
Tax withholdings related to net share settlements of stock-based compensation awards		(0.1)			(0.1)
Stock-based compensation		2.6			2.6
Employee stock purchase plan		0.7			0.7
Other		$ 0.1
Ending balance (in shares) at Jun. 30, 2020		169.0		169.0
Ending balance at Jun. 30, 2020		$ 1,703.2		$ 1.7	$ 2,977.3	$ (800.8)	$ (475.0)

[1] Adjusted due to the adoption of ASU 2018-02 “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” on January 1, 2019.

[2] Refer to “Note 3: Business combinations” for more information.