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Operating Segment and Related Information - Long-term investments, Property and Equipment and Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments $ 52.7 $ 55.4
Total Assets 6,406.0 6,742.8
Operating Segments | Infrastructure    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 0.9 0.9
Total Assets 503.1 494.8
Operating Segments | Life Sciences    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 16.9 18.4
Total Assets 26.0 21.4
Operating Segments | Spectrum    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 209.7 213.6
Operating Segments | Insurance    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 5,627.0 5,854.0
Operating Segments | Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 34.9 36.1
Total Assets 38.8 167.3
Non-operating Corporate    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 41.4 30.1
Intersegment Eliminations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets $ (40.0) $ (38.4)