Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

Shareholders' Equity - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]    
Cash dividends paid on common stock $ 12.6us-gaap_PaymentsOfDividendsCommonStock $ 12.4us-gaap_PaymentsOfDividendsCommonStock
Shares repurchased 222,000us-gaap_TreasuryStockSharesAcquired  
Amount of shares repurchased $ 6.8us-gaap_PaymentsForRepurchaseOfCommonStock $ 0us-gaap_PaymentsForRepurchaseOfCommonStock
Common stock, shares issued 130,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation  
Treasury Stock [Member]    
Class of Stock [Line Items]    
Common stock, shares issued 200,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember