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Restrictions on Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]    
Collateral $ 45.1 $ 14.0
Subsidiaries    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash reserves due from subsidiary $ 156.8 $ 124.4