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Regulatory Capital and Dividends - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Statutory Accounting Practices [Line Items]    
Statutory net income $ 226.0us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount  
Statutory capital and surplus 719.0us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance  
Predecessor    
Statutory Accounting Practices [Line Items]    
Statutory net income   7.7us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Statutory capital and surplus   $ 332.5us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember