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Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Finite-Lived Intangible Assets          
Gross carrying amount $ 203.5   $ 203.5   $ 204.0
Accumulated amortization 58.2   58.2   46.6
Intangible assets, net 177.3   177.3   189.4
Amortization expense 5.7 $ 2.9 11.6 $ 5.8  
2023 11.4   11.4    
2024 22.4   22.4    
2025 16.5   16.5    
2026 16.5   16.5    
2027 15.8   15.8    
Finite-Lived Intangible Asset, Expected Amortization, after Year Five 62.7   62.7    
Finite-Lived Intangible Assets, Net 145.3   145.3    
Proceeds from Sale of Other Assets     7.2 $ 0.0  
Payments for Commissions     1.8    
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions     0.5    
Trademarks          
Finite-Lived Intangible Assets          
Unamortized intangible assets, gross carrying amount 32.0   32.0   32.0
Trademarks          
Finite-Lived Intangible Assets          
Gross carrying amount 16.0   16.0   16.0
Accumulated amortization 1.8   1.8   1.2
Customer relationships          
Finite-Lived Intangible Assets          
Gross carrying amount 120.6   120.6   121.1
Accumulated amortization 22.5   22.5   16.0
Unpatented Technology [Member]          
Finite-Lived Intangible Assets          
Gross carrying amount 64.5   64.5   64.5
Accumulated amortization 31.9   31.9   27.4
Other          
Finite-Lived Intangible Assets          
Gross carrying amount 2.4   2.4   2.4
Accumulated amortization $ 2.0   $ 2.0   $ 2.0