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Segment Information - Revenues, operating profit, total assets, and long-lived assets for U.S. and non-U.S. operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 2,883.4 $ 2,569.9 $ 2,307.9
Operating profit (loss) 341.9 197.6 217.3
Total Assets 4,985.2 4,915.5 3,577.9
UNITED STATES      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 2,989.3 2,603.8 2,312.0
Operating profit (loss) 344.0 199.9 210.7
Total Assets 4,821.0 4,762.6  
Long-Lived Assets 1,990.6 2,024.9  
UNITED STATES | External      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 2,877.5 2,556.2 2,271.5
UNITED STATES | Intercompany      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 111.8 47.6 40.5
Non-US      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 90.0 91.5 98.8
Operating profit (loss) (2.1) (2.3) 6.6
Total Assets 164.2 152.9  
Long-Lived Assets 107.2 104.5  
Non-US | External      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 5.9 13.7 36.4
Non-US | Intercompany      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 84.1 $ 77.8 $ 62.4