Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid In Capital [Member]	Additional Paid In Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2020	$ 2,098.2		$ 1.5	$ 2,606.5		$ (233.8)		$ (276.0)
Balance, shares at Dec. 31, 2020			148,571,412
Net income (loss)	(19.2)					(19.2)
Issuance of common stock under share-based compensation plans	11.3			11.3
Issuance of common stock under share-based compensation plans, shares			341,975
Share-based compensation	22.8			22.8
Equity component of convertible senior notes	77.7			77.7
Purchase of capped calls related to convertible senior notes	(33.0)			(33.0)
Foreign currency translation	11.0							11.0
Change in unrealized (loss) gain, net of tax	(12.3)							(12.3)
Change in pension liability adjustment, net of tax	2.8							2.8
Ending balance at Mar. 31, 2021	2,159.3		$ 1.5	2,685.3		(253.0)		(274.5)
Balance, shares at Mar. 31, 2021			148,913,387
Beginning balance at Dec. 31, 2020	2,098.2		$ 1.5	2,606.5		(233.8)		(276.0)
Balance, shares at Dec. 31, 2020			148,571,412
Net income (loss)	(45.0)
Ending balance at Jun. 30, 2021	2,199.8		$ 1.5	2,739.8		(278.8)		(262.7)
Balance, shares at Jun. 30, 2021			149,752,249
Beginning balance at Mar. 31, 2021	2,159.3		$ 1.5	2,685.3		(253.0)		(274.5)
Balance, shares at Mar. 31, 2021			148,913,387
Net income (loss)	(25.8)					(25.8)
Issuance of common stock under share-based compensation plans	23.1			23.1
Issuance of common stock under share-based compensation plans, shares			838,862
Share-based compensation	31.4			31.4
Foreign currency translation	13.0							13.0
Change in unrealized (loss) gain, net of tax	(4.0)							(4.0)
Change in pension liability adjustment, net of tax	2.8							2.8
Ending balance at Jun. 30, 2021	2,199.8		$ 1.5	2,739.8		(278.8)		(262.7)
Balance, shares at Jun. 30, 2021			149,752,249
Beginning balance at Dec. 31, 2021	$ 2,227.5	$ (67.7)	$ 1.5	2,860.0	$ (77.7)	(309.2)	$ 10.0	(324.8)
Balance, shares at Dec. 31, 2021			151,995,031
Accounting Standards Update [Extensible List]	ASU 2020-06 [Member]
Net income (loss)	$ (27.4)					(27.4)
Issuance of common stock under share-based compensation plans	6.0			6.0
Issuance of common stock under share-based compensation plans, shares			535,418
Share-based compensation	35.5			35.5
Foreign currency translation	15.6							15.6
Change in unrealized (loss) gain, net of tax	(51.0)							(51.0)
Change in pension liability adjustment, net of tax	2.3							2.3
Ending balance at Mar. 31, 2022	2,140.8		$ 1.5	2,823.8		(326.6)		(357.9)
Balance, shares at Mar. 31, 2022			152,530,449
Beginning balance at Dec. 31, 2021	2,227.5	$ (67.7)	$ 1.5	2,860.0	$ (77.7)	(309.2)	$ 10.0	(324.8)
Balance, shares at Dec. 31, 2021			151,995,031
Net income (loss)	(47.2)
Ending balance at Jun. 30, 2022	2,094.3		$ 1.5	2,869.9		(346.4)		(430.7)
Balance, shares at Jun. 30, 2022			153,033,594
Beginning balance at Mar. 31, 2022	2,140.8		$ 1.5	2,823.8		(326.6)		(357.9)
Balance, shares at Mar. 31, 2022			152,530,449
Net income (loss)	(19.8)					(19.8)
Issuance of common stock under share-based compensation plans	7.3			7.3
Issuance of common stock under share-based compensation plans, shares			503,145
Share-based compensation	38.8			38.8
Foreign currency translation	(47.4)							(47.4)
Change in unrealized (loss) gain, net of tax	(27.5)							(27.5)
Change in pension liability adjustment, net of tax	2.1							2.1
Ending balance at Jun. 30, 2022	$ 2,094.3		$ 1.5	$ 2,869.9		$ (346.4)		$ (430.7)
Balance, shares at Jun. 30, 2022			153,033,594