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Borrowing Arrangements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 12, 2018
Agreement termination date   Jul. 13, 2021        
Cash and cash equivalents   $ 111.3 $ 176.7 $ 134.3 $ 347.1  
Domestic Line of Credit [Member]            
Revolving credit facility amount   $ (175.0)        
Line of Credit Facility, Interest Rate at Period End   12500.00%        
Outstanding letter of credit accrued fees and expenses   $ 13.9        
Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses   159.0        
Future maturities of outstanding borrowings            
Line of Credit Facility, Maximum Borrowing Capacity   175.0        
Potential increase size of the credit facility by an additional amount   150.0        
Aggregate commitments availability   $ 17.5        
Aggregate commitments availability, percentage   10.00%        
Line of Credit Facility, Remaining Borrowing Capacity   $ 159.0        
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)        
Future maturities of outstanding borrowings            
Line of Credit Facility, Maximum Borrowing Capacity   25.0        
Letters Of Credit Outstanding [Member]            
Revolving credit facility amount   (60.0)        
Future maturities of outstanding borrowings            
Line of Credit Facility, Maximum Borrowing Capacity   $ 60.0        
5.5% Senior Notes            
Debt Instrument, Interest Rate, Effective Percentage   5.50%        
Future maturities of outstanding borrowings            
Financial Liabilities Fair Value Disclosure   $ 435.4        
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%