Consolidated Statement of Changes in Equity - USD ($) shares in Millions, $ in Millions	Total	Ordinary Shares	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Unrealized Hedging (Losses) Gains	Foreign Currency Translation	Defined Benefit Plans	Total Accumulated Other Comprehensive Loss, net of tax	Total Equity
Beginning Balance (in shares) at Dec. 31, 2016		143.1
Beginning balance at Dec. 31, 2016		$ 1,430.8		$ 230.4	$ (927.2)	$ 17.4	$ (155.5)	$ (10.4)	$ (148.5)	$ 585.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchase		1.3
Share repurchase		$ 13.9		3.7						17.6
Net income (loss)	$ (221.3)				(221.3)					(221.3)
Stock-based compensation				49.0						49.0
Vesting of shares related to equity compensation plans, net amounts withheld for payment of taxes (in shares)		0.7
Vesting of shares related to equity compensation plans, net amounts withheld for payment of taxes		$ 6.6		(1.3)						5.3
Foreign currency translation							54.4		54.4	54.4
Defined benefit plans actuarial gain								2.3	2.3	2.3
Unrealized loss on hedging instruments						(14.6)			(14.6)	(14.6)
Amounts reclassified from AOCI to the statement of operations						16.8		2.4	19.2	19.2
Foreign currency translation				2.0						2.0
Ending Balance (in shares) at Dec. 31, 2017		145.1
Ending balance at Dec. 31, 2017		$ 1,451.3		283.8	(1,148.5)	19.6	(101.1)	(5.7)	(87.2)	499.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(185.8)				(185.8)					(185.8)
Stock-based compensation				77.9						77.9
Vesting of shares related to equity compensation plans, net amounts withheld for payment of taxes (in shares)		1.2
Vesting of shares related to equity compensation plans, net amounts withheld for payment of taxes		$ 0.1								0.1
Foreign currency translation							(62.3)		(62.3)	(62.3)
Defined benefit plans actuarial gain								0.8	0.8	0.8
Unrealized loss on hedging instruments						7.5			7.5	7.5
Amounts reclassified from AOCI to the statement of operations						(13.2)			(13.2)	(13.2)
Other activity				(3.4)						(3.4)
Net loss		0.8		8.8						9.6
Capital reduction		$ (1,436.7)		1,436.7
Share issuances (in shares)		8.0
Proceeds From IPO And Concurrent Private Placement Net of Underwriting and Other Expenses		62.3
Proceeds From IPO And Concurrent Private Placement Net of Underwriting and Other Expenses		$ 6.2		987.4						993.6
Ending Balance (in shares) at Dec. 31, 2018		216.6
Ending balance at Dec. 31, 2018	1,360.1	$ 21.7		2,791.2	(1,298.4)	13.9	(163.4)	(4.9)	(154.4)	1,360.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0.2				0.2					0.2
Stock-based compensation				61.3						61.3
Vesting of shares related to equity compensation plans, net amounts withheld for payment of taxes (in shares)		2.9
Vesting of shares related to equity compensation plans, net amounts withheld for payment of taxes		$ 0.3		(31.8)						(31.5)
Foreign currency translation							5.0	0.0	5.0	5.0
Defined benefit plans actuarial gain								(1.1)	(1.1)	(1.1)
Unrealized loss on hedging instruments	(88.5)					(88.5)			(88.5)
Amounts reclassified from AOCI to the statement of operations						(3.8)			(3.8)	(3.8)
Share repurchase			$ (0.4)							(0.4)
Ending Balance (in shares) at Dec. 31, 2019		219.5
Ending balance at Dec. 31, 2019	$ 1,301.3	$ 22.0	$ (0.4)	$ 2,819.5	$ (1,297.0)	$ (78.4)	$ (158.4)	$ (6.0)	$ (242.8)	$ 1,301.3