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LONG-TERM OBLIGATIONS (Details)
$ / shares in Units, € in Millions, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 10 Months Ended
Aug. 31, 2012
Jun. 30, 2016
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
May 28, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
Jun. 01, 2015
USD ($)
shares
Aug. 13, 2014
EUR (€)
Aug. 13, 2014
USD ($)
Nov. 26, 2012
USD ($)
Mar. 26, 2012
USD ($)
Jun. 03, 2009
USD ($)
Nov. 13, 2007
USD ($)
Debt Instrument                            
Letters of Credit Outstanding, Amount   $ 217.3   $ 217.3     $ 210.9              
Loss on early extinguishment of debt   $ (0.4) $ 0.0 (0.4) $ 0.0                  
Repayments of Debt       $ 681.5 702.9                  
Shares, Issued | shares               3.4            
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.01   $ 0.01     $ 0.01              
Credit Agreement 2014 [Member]                            
Debt Instrument                            
Revolving line of credit available borrowing capacity                   $ 600.0        
Long-term Line of Credit   $ 100.0   $ 100.0                    
Springing Covenant Threshold                 30.00% 30.00%        
Debt Instrument Covenant Minimum Interest Coverage Ratio       2.5                    
Debt Instrument Covenant Senior Secured Debt Leverage Ratio Maximum       2.75                    
Long-term Debt   $ 442.0   $ 442.0     $ 439.2              
Debt, Weighted Average Interest Rate   3.50%   3.50%     3.50%              
Maximum amount of letters of credit available under the Credit Agreement                   $ 400.0        
Letters of Credit Outstanding, Amount   $ 0.0   $ 0.0                    
Letters of Credit Maximum Available under Additional Facilities                   $ 300.0        
Percentage of capital stock of foreign subsidiary pledged as collateral for borrowings (as a percent)                 65.00% 65.00%        
Term Loan                            
Debt Instrument                            
Long-term Line of Credit                   $ 230.0        
Long-term Debt   224.5   $ 224.5                    
Term Loan Euro                            
Debt Instrument                            
Long-term Line of Credit | €                 € 200.0          
Debt Instrument, Basis Spread on Variable Rate       2.75%   3.25%                
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum       0.75%                    
Long-term Debt   217.5   $ 217.5                    
2014 Credit Agreement Additional LC Arrangements                            
Debt Instrument                            
Letters of Credit Outstanding, Amount   $ 35.2   $ 35.2     $ 21.2              
Revolving Credit Facility                            
Debt Instrument                            
Revolving line of credit available borrowing capacity                   $ 600.0        
Debt, Weighted Average Interest Rate   2.60%   2.60%                    
Bilateral Arrangements                            
Debt Instrument                            
Letters of Credit Outstanding, Amount   $ 182.1   $ 182.1     189.7              
Bilateral Arrangements | Discontinued Operations                            
Debt Instrument                            
Letters of Credit Outstanding, Amount   162.6   162.6     153.6              
6.5% Senior Notes Due April 1, 2020                            
Debt Instrument                            
Long-term Debt   $ 300.0   300.0               $ 300.0    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   103.25%                        
Interest rate of debt securities (as a percent)                       6.50%    
Senior Notes Due May 15, 2021 Six Percent                            
Debt Instrument                            
Long-term Debt   $ 850.0   850.0             $ 850.0      
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   103.00%                        
Interest rate of debt securities (as a percent)                     6.00%      
8% Senior Subordinated Notes due November 15, 2017                            
Debt Instrument                            
Long-term Debt                           $ 800.0
Interest rate of debt securities (as a percent)                           8.00%
4% Convertible Senior Subordinated Notes due June 1, 2015                            
Debt Instrument                            
Long-term Debt                         $ 172.5  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 25.00%                          
Interest rate of debt securities (as a percent)                         4.00%  
Carrying value of the equity component of convertible debt                         $ 54.3  
Deferred tax liability on equity component of debt                         $ 19.4  
Interest expense on convertible debt         5.7                  
Long-Term Debt Maturity Value               $ 128.8            
Repayments of Debt         131.1                  
Interest Paid         $ 2.3                  
Securitization 2015                            
Debt Instrument                            
Revolving line of credit available borrowing capacity           $ 350.0                
Long-term Line of Credit   $ 0.0   0.0     $ 206.5              
Debt, Weighted Average Interest Rate             1.46%              
Loss on early extinguishment of debt       (0.4)                    
Debt Instrument, Interest Rate, Effective Percentage             2.13%              
Commitment Letter | Revolving Credit Facility                            
Debt Instrument                            
Debt Instrument, Unused Borrowing Capacity, Fee       $ 7.2