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Stock-Based Compensation (Stock-Based Compensation Costs) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Share-based Compensation [Abstract]      
Restricted Stock or Unit Expense $ 0.1us-gaap_RestrictedStockExpense $ 0.6us-gaap_RestrictedStockExpense $ 1.9us-gaap_RestrictedStockExpense
Stock or Unit Option Plan Expense 0.1us-gaap_StockOptionPlanExpense 0us-gaap_StockOptionPlanExpense 0.1us-gaap_StockOptionPlanExpense
Allocated Share-based Compensation Expense $ 0.2us-gaap_AllocatedShareBasedCompensationExpense $ 0.6us-gaap_AllocatedShareBasedCompensationExpense $ 2.0us-gaap_AllocatedShareBasedCompensationExpense