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Operating Segment and Related Information - Long-term investments, Property and Equipment and Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments $ 4,198.1 $ 3,822.0
Property, plant and equipment, net 416.4 376.3
Total Assets 6,883.2 6,503.8
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 223.8 178.2
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 187.6 192.7
Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 5.0 5.4
Operating Segments | Construction    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 0.9 0.9
Total Assets 535.0 537.9
Operating Segments | Marine Services    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 65.9 58.3
Total Assets 380.6 368.6
Operating Segments | Insurance    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 4,213.7 3,821.4
Total Assets 5,517.5 5,213.1
Operating Segments | Life Sciences    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 15.7 16.3
Total Assets 38.3 35.6
Operating Segments | Energy    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 122.1 77.6
Operating Segments | Telecommunications    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 122.5 139.9
Operating Segments | Broadcasting    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 245.2 202.8
Operating Segments | Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 3.3 5.6
Total Assets 3.4 5.6
Operating Segments | Non-operating Corporate    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 20.0 9.2
Eliminations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments (101.4) (80.5)
Total Assets $ (101.4) $ (86.5)