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Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Jun. 30, 2026
Assets:    
Cash and cash equivalents $ 182.0 $ 70.4
Equity securities 1.4 110.9
Total assets 183.4 181.3
Liabilities:    
Total accounts payable and other accrued liabilities, current 15.0 20.7
Total liabilities 15.0 20.7
Put Right    
Liabilities:    
Put Right $ 15.0 20.7
DSA, term 2 years  
Level 1    
Assets:    
Cash and cash equivalents $ 182.0 70.4
Equity securities 1.4 110.9
Total assets 183.4 181.3
Liabilities:    
Total accounts payable and other accrued liabilities, current 0.0 0.0
Total liabilities 0.0 0.0
Level 1 | Put Right    
Liabilities:    
Put Right 0.0 0.0
Level 2    
Assets:    
Cash and cash equivalents 0.0 0.0
Equity securities 0.0 0.0
Total assets 0.0 0.0
Liabilities:    
Total accounts payable and other accrued liabilities, current 15.0 20.7
Total liabilities 15.0 20.7
Level 2 | Put Right    
Liabilities:    
Put Right 15.0 20.7
Level 3    
Assets:    
Cash and cash equivalents 0.0 0.0
Equity securities 0.0 0.0
Total assets 0.0 0.0
Liabilities:    
Total accounts payable and other accrued liabilities, current 0.0 0.0
Total liabilities 0.0 0.0
Level 3 | Put Right    
Liabilities:    
Put Right 0.0 0.0
SpaceX    
Assets:    
Equity securities   110.9
SpaceX | Level 1    
Assets:    
Equity securities   110.9
SpaceX | Level 2    
Assets:    
Equity securities   0.0
SpaceX | Level 3    
Assets:    
Equity securities   $ 0.0
Other    
Assets:    
Equity securities 1.4  
Other | Level 1    
Assets:    
Equity securities 1.4  
Other | Level 2    
Assets:    
Equity securities 0.0  
Other | Level 3    
Assets:    
Equity securities $ 0.0