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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Policy Acquisition Costs $ 294.3       $ 358.4       $ 361.1       $ 294.3 $ 358.4 $ 361.1  
Net Reserves for Losses and LAE 5,234.3       4,759.2       4,583.4       5,234.3 4,759.2 4,583.4 $ 4,400.8
Net Reserves for Unearned Premiums 1,335.3       1,363.4       1,418.3       1,335.3 1,363.4 1,418.3  
Net earned premium 511.0 $ 652.5 $ 562.0 $ 581.1 612.4 $ 681.0 $ 680.8 $ 663.1 629.7 $ 640.6 $ 609.4 $ 593.6 2,306.6 2,637.3 2,473.3  
Net Investment Income                         189.0 187.1 185.5  
Losses and LAE Expenses                         1,994.7 1,576.1 1,366.2  
Policy Acquisition Expenses                         400.5 528.9 483.6  
Net written premiums                         2,212.5 2,593.7 2,646.2  
General and Administrative Expenses                         411.2 406.6 360.1  
Reinsurance                                
Deferred Policy Acquisition Costs 263.0       239.6       235.2       263.0 239.6 235.2  
Net Reserves for Losses and LAE 2,917.1       2,462.1       2,409.5       2,917.1 2,462.1 2,409.5  
Net Reserves for Unearned Premiums 1,067.3       813.3       484.2       1,067.3 813.3 484.2  
Net earned premium                         1,206.1 1,181.9 1,072.6  
Losses and LAE Expenses                         1,116.4 657.9 491.6  
Policy Acquisition Expenses                         235.5 226.4 224.7  
Net written premiums                         1,250.0 1,269.2 1,153.5  
General and Administrative Expenses                         157.3 178.2 146.5  
Insurance                                
Deferred Policy Acquisition Costs 31.3       118.8       125.9       31.3 118.8 125.9  
Net Reserves for Losses and LAE 2,317.2       2,297.1       2,173.9       2,317.2 2,297.1 2,173.9  
Net Reserves for Unearned Premiums $ 268.0       $ 550.1       $ 934.1       268.0 550.1 934.1  
Net earned premium                         1,100.5 1,455.4 1,400.7  
Losses and LAE Expenses                         878.3 918.2 874.6  
Policy Acquisition Expenses                         165.0 302.5 258.9  
Net written premiums                         962.5 1,324.5 1,492.7  
General and Administrative Expenses                         $ 253.9 $ 228.4 $ 213.6