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Operating Segments and Related Information - Long-term investments, Property and Equipment and Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments $ 59.5 $ 56.0
Equity Method Investments (included in Investments above) 43.6 38.8
Assets 1,151.7 1,080.6
Operating Segments | Infrastructure    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 0.0 0.7
Equity Method Investments (included in Investments above) 0.0 0.7
Assets 879.3 786.4
Operating Segments | Life Sciences    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 7.6 10.2
Equity Method Investments (included in Investments above) 3.0 4.2
Assets 15.4 22.0
Operating Segments | Spectrum    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets 188.2 198.9
Operating Segments | Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 51.9 45.1
Equity Method Investments (included in Investments above) 40.6 33.9
Assets 53.6 48.0
Non-operating Corporate    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets $ 15.2 $ 25.3