Organization and Significant Accounting Policies - Error Corrections and Prior Period Adjustments (Details) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	Jun. 10, 2022	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares		Dec. 31, 2020 USD ($) $ / shares shares		Dec. 31, 2019	Jan. 01, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stock split ratio	4		4		4		4
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets		$ 341.2	$ 290.5	[1]	$ 307.7
Long-term senior convertible notes		1,197.7	1,981.8	[1]	2,033.1
Common stock		0.4	0.4	[1]	0.4
Additional paid-in capital		2,258.1	2,108.7	[1]	1,726.5
Retained earnings (accumulated deficit)		479.9	138.7	[1]	(78.2)
Loss on extinguishment of debt		0.0	(0.1)	[2],[3]	0.0	[2],[3]
Interest expense		(18.6)	(18.8)	[2]	(17.7)	[2]
Income before income taxes		390.8	256.8	[2]	297.9	[2]
Income tax expense (benefit)		49.6	39.9	[2]	(251.8)	[2]
Net income		$ 341.2	$ 216.9	[2],[3]	$ 549.7	[2],[3]
Basic net income per share (usd per share) | $ / shares		$ 0.88	$ 0.56	[2]	$ 1.46	[2]
Diluted net income per share (usd per share) | $ / shares		$ 0.82	$ 0.53	[2]	$ 1.33	[2]
Shares used to compute diluted net income per share (in shares) | shares		427.5	428.8	[2]	420.4	[2]
Prepaid and other current assets		$ 192.6	$ 81.6	[1]
Current portion of long-term senior convertible notes		772.6	0.0	[1]
Add back interest expense, net of tax attributable to assumed conversion of senior convertible notes		11.0	11.4		$ 11.1
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets		293.1	220.8		216.4
Long-term senior convertible notes		1,034.9	1,702.7		1,667.2
Common stock			0.1		0.1
Additional paid-in capital		2,652.2	2,504.5		2,125.3
Retained earnings (accumulated deficit)		231.1	(47.4)		(202.1)
Loss on extinguishment of debt		(0.4)	(1.5)		(5.9)
Interest expense		(101.9)	(100.3)		(84.7)
Income before income taxes		307.1	173.9		225.0
Income tax expense (benefit)		28.6	19.2		(268.6)
Net income		$ 278.5	$ 154.7		$ 493.6
Basic net income per share (usd per share) | $ / shares		$ 0.72	$ 0.40		$ 1.31
Diluted net income per share (usd per share) | $ / shares		$ 0.70	$ 0.39		$ 1.27
Shares used to compute diluted net income per share (in shares) | shares		400.5	400.4		389.8
Prepaid and other current assets		$ 191.5
Current portion of long-term senior convertible notes		740.9
ASU 2020-06 Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets		48.1	$ 69.7		$ 91.3
Long-term senior convertible notes		162.8	279.1		365.9
Common stock			0.0		0.0
Additional paid-in capital		(394.1)	(395.5)		(398.5)			$ 242.3
Retained earnings (accumulated deficit)		248.8	186.1		123.9			$ 67.8
Loss on extinguishment of debt		0.4	1.4		5.9
Interest expense		83.3	81.5		67.0
Income before income taxes		83.7	82.9		72.9
Income tax expense (benefit)		21.0	20.7		16.8
Net income		$ 62.7	$ 62.2		$ 56.1
Basic net income per share (usd per share) | $ / shares		$ 0.16	$ 0.16		$ 0.15
Diluted net income per share (usd per share) | $ / shares		$ 0.12	$ 0.14		$ 0.06
Shares used to compute diluted net income per share (in shares) | shares		27.0	28.4		30.6
Prepaid and other current assets		$ 1.1
Current portion of long-term senior convertible notes		$ 31.7
Stock Split Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets			$ 0.0		$ 0.0
Long-term senior convertible notes			0.0		0.0
Common stock			0.3		0.3
Additional paid-in capital			(0.3)		(0.3)
Retained earnings (accumulated deficit)			$ 0.0		$ 0.0

[1] * We adjusted our 2021 amounts to reflect the simplified convertible instruments accounting guidance, which we adopted on a full retrospective basis. All periods presented have also been adjusted to reflect the four-for-one stock split. Refer to Note 1, “Organization and Significant Accounting Policies,” to the consolidated financial statements for further information.

[2] * We adjusted our 2021 and 2020 amounts to reflect the simplified convertible instruments accounting guidance, which we adopted on a full retrospective basis. All periods presented have also been adjusted to reflect the four-for-one stock split. Refer to Note 1, “Organization and Significant Accounting Policies,” to the consolidated financial statements for further information.

[3] * We adjusted our 2021 and 2020 amounts to reflect the simplified convertible instruments accounting guidance, which we adopted on a full retrospective basis. Refer to Note 1, “Organization and Significant Accounting Policies,” to the consolidated financial statements for further information.