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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SUPPLEMENTARY INSURANCE INFORMATION      
Net investment income $ 86.8 $ 60.8 $ 59.5
OneBeacon      
SUPPLEMENTARY INSURANCE INFORMATION      
Deferred acquisition costs 96.3 100.7 103.2
Future policy benefits, losses, claims and loss expenses 1,365.6 1,389.8 1,342.2
Unearned premiums 575.1 560.3 588.3
Other policy claims and benefits payable 0.0 0.0 0.0
Premiums earned 1,100.6 1,176.2 1,177.1
Net investment income 50.6 45.9 43.4
Benefits, claims, losses, and settlement expenses 656.0 700.7 815.1
Amortization of deferred policy acquisition costs 206.0 213.8 203.3
Other operating expenses 209.0 218.2 179.2
Premiums written 1,100.7 1,136.6 1,216.9
Net investment income 50.6 45.9 43.4
HG Global-BAM      
SUPPLEMENTARY INSURANCE INFORMATION      
Deferred acquisition costs 10.6 6.9 4.0
Future policy benefits, losses, claims and loss expenses 0.0 0.0 0.0
Unearned premiums 82.9 50.2 27.6
Other policy claims and benefits payable 0.0 0.0 0.0
Premiums earned 5.9 3.3 1.8
Net investment income 9.0 6.1 7.1
Benefits, claims, losses, and settlement expenses 0.0 0.0 0.0
Amortization of deferred policy acquisition costs 3.4 2.9 2.1
Other operating expenses 0.4 0.4 0.4
Premiums written 38.6 25.9 16.2
Other Operations      
SUPPLEMENTARY INSURANCE INFORMATION      
Deferred acquisition costs 0.0 0.0 0.0
Future policy benefits, losses, claims and loss expenses 5.0 6.0 7.8
Unearned premiums 1.2 2.1 0.8
Other policy claims and benefits payable 0.0 0.0 0.0
Premiums earned 7.5 8.7 6.1
Net investment income 0.2 0.2 0.2
Benefits, claims, losses, and settlement expenses 8.0 8.2 8.9
Amortization of deferred policy acquisition costs 2.2 3.4 0.8
Other operating expenses 0.1 0.0 0.0
Premiums written 6.5 10.1 5.9
Non-insurance [Member] | Operating Segments      
SUPPLEMENTARY INSURANCE INFORMATION      
Net investment income $ 27.0 $ 8.6 $ 8.8