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New Accounting Standards (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Significant Accounting Policies [Line Items]      
Additional paid-in capital $ (3,032.7) $ (3,012.7)  
Deferred tax liabilities (21.0) (101.4)  
Retained earnings $ 947.5 $ 852.5  
Convertible notes weighted-average shares outstanding (in shares) 14.7 14.7 5.9
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