New Accounting Standards (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Additional paid-in capital	$ (3,012.7)	$ (3,051.6)
Deferred tax liabilities	(101.4)	(142.4)
Retained earnings	$ 852.5	$ 682.2
Convertible notes weighted-average shares outstanding (in shares)	14.7	5.9	0.0
Interest expense	$ 6.4	$ 0.0	$ 0.0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
Significant Accounting Policies [Line Items]
Additional paid-in capital		57.1
Convertible notes payable		57.9
Deferred tax liabilities		13.2
Retained earnings		$ 12.4
Convertible notes weighted-average shares outstanding (in shares)		14.7