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Long-Term Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
PCN
Sep. 30, 2012
PCN
Dec. 31, 2012
Domestic And Multi Currency Line Of Credit Up To $380 Due 2015 [Member]
     
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 380.0    
Multi Currency Line Of Credit Fifty Million Due 2015[Member]
     
Debt Instrument [Line Items]      
Maximum borrowing capacity 0    
Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
     
Debt Instrument [Line Items]      
Maximum borrowing capacity 280.0    
Weighted average interest rate 2.81% 2.75% 3.06%
Commitment fee, percentage 0.38%    
NumberOfPricingTranches 3 3  
Debt Issuance Costs 1.8    
Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2018 [Member]
     
Debt Instrument [Line Items]      
Maximum borrowing capacity 100.0    
Variable Rate Senior Unsecured Note Due 2018 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, maturity year 2018    
Debt Instrument, Face Amount 50.0    
Weighted average interest rate 3.69% 3.75% 3.75%
Debt Instrument, Periodic Payment, Principal 2.1    
Debt instrument, maturity date Mar. 31, 2018    
Debt Instrument Frequency Of Periodic Payment Quarterly    
5.75% $300 Million Senior Unsecured Notes
     
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 300.0    
Issurance Cost Amortization Period, in years 5 years    
Debt Issuance Costs 8.1    
Debt instrument, interest rate 5.75%    
Debt instrument, maturity date May 15, 2018    
Debt Instrument, Issuance Date May 15, 2013    
Note Redeem Rate 100.00%    
Note Repurchase Rate 101.00%    
Letter Of Credit Facility [Member]
     
Debt Instrument [Line Items]      
Letter of credit facility, amount 20.0    
Standby Letters Of Credit [Member]
     
Debt Instrument [Line Items]      
Letter of credit facility, amount $ 16.3    
LIBOR [Member] | Variable Rate Senior Unsecured Note Due 2018 [Member]
     
Debt Instrument [Line Items]      
Debt instrument basis spread on variable rate 3.50%    
Agent's Base Rate [Member] | Variable Rate Senior Unsecured Note Due 2018 [Member]
     
Debt Instrument [Line Items]      
Debt instrument basis spread on variable rate 2.00%    
Maximum [Member]
     
Debt Instrument [Line Items]      
Debt instrument, maturity days   31 days  
Maximum [Member] | Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
     
Debt Instrument [Line Items]      
Commitment fee, percentage 0.50%    
Debt instrument, maturity days 31 days    
Maximum [Member] | LIBOR [Member] | Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
     
Debt Instrument [Line Items]      
Debt instrument basis spread on variable rate 3.25%    
Maximum [Member] | Agent's Base Rate [Member] | Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
     
Debt Instrument [Line Items]      
Debt instrument basis spread on variable rate 1.75%    
Minimum [Member]
     
Debt Instrument [Line Items]      
Debt instrument, maturity days   2 days  
Minimum [Member] | Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
     
Debt Instrument [Line Items]      
Commitment fee, percentage 0.25%    
Debt instrument, maturity days 1 day    
Minimum [Member] | LIBOR [Member] | Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
     
Debt Instrument [Line Items]      
Debt instrument basis spread on variable rate 2.00%    
Minimum [Member] | Agent's Base Rate [Member] | Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2018 [Member]
     
Debt Instrument [Line Items]      
Debt instrument basis spread on variable rate 0.50%