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SCHEDULE IV REINSURANCE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Premiums earned      
Gross amount $ 1,198.1 $ 1,322.0 $ 1,233.5
Ceded to other companies (113.5) (179.7) (119.4)
Assumed from other companies 29.4 45.9 70.9
Net earned premiums 1,114.0 1,188.2 1,185.0
OneBeacon      
Premiums earned      
Gross amount 1,177.0 1,298.0 1,209.1
Ceded to other companies (105.8) (167.7) (102.9)
Assumed from other companies 29.4 45.9 70.9
Net earned premiums $ 1,100.6 $ 1,176.2 $ 1,177.1
Percentage of amount assumed to net 2.70% 3.90% 6.00%
HG/BAM      
Premiums earned      
Gross amount $ 5.9 $ 3.3 $ 1.8
Ceded to other companies 0.0 0.0 0.0
Assumed from other companies 0.0 0.0 0.0
Net earned premiums $ 5.9 $ 3.3 $ 1.8
Percentage of amount assumed to net 0.00% 0.00% 0.00%
Other Segments      
Premiums earned      
Gross amount $ 15.2 $ 20.7 $ 22.6
Ceded to other companies (7.7) (12.0) (16.5)
Assumed from other companies 0.0 0.0 0.0
Net earned premiums $ 7.5 $ 8.7 $ 6.1
Percentage of amount assumed to net 0.00% 0.00% 0.00%