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Borrowing Arrangements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2015
Cash and cash equivalents $ 198.8   $ 348.3 $ 347.1 $ 361.7
Domestic Line of Credit [Member]          
Revolving credit facility amount (175.0)        
Potential increase size of the credit facility by an additional amount $ 150.0        
Line of Credit Facility, Interest Rate at Period End 12500.00%        
Agreement termination date Jul. 13, 2021        
Aggregate commitments availability $ 17.5        
Aggregate commitments availability, percentage 10.00%        
Outstanding letter of credit accrued fees and expenses $ 16.1        
Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses 93.8        
Unsecured Debt [Member]          
Long-term Debt, Gross 450.0        
Future maturities of outstanding borrowings          
Payments of Debt Issuance Costs   $ 6.6      
Swing Line Loans [Member]          
Revolving credit facility amount $ (25.0)        
Letters Of Credit Outstanding [Member]          
Revolving credit facility amount     $ (60.0)    
Bonds [Member]          
Debt Instrument, Interest Rate, Effective Percentage 5.50%        
Future maturities of outstanding borrowings          
Financial Liabilities Fair Value Disclosure $ 436.5        
Minimum [Member] | Domestic Line of Credit [Member]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     2500.00%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Long-term Debt [Member]          
Debt Instrument, Basis Spread on Variable Rate 2500.00%        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Domestic Line of Credit [Member]          
Debt Instrument, Basis Spread on Variable Rate 12500.00%        
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Domestic Line of Credit [Member]          
Debt Instrument, Basis Spread on Variable Rate 15000.00%        
Base Rate [Member] | Maximum [Member] | Domestic Line of Credit [Member]          
Debt Instrument, Basis Spread on Variable Rate 5000.00%