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Other Debt Disclosures Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                
Gain on settlement of capital lease $ 0.0 $ 0.0   $ 15.6 $ 0.0      
Long-term Debt, Current Maturities $ 16.5     $ 16.5       $ 5.9
Long-term Debt, Weighted Average Interest Rate, at Point in Time 5.90%     5.90%       5.70%
Capital Lease Obligations [Member]                
Debt Instrument [Line Items]                
Repayments of Debt and Capital Lease Obligations $ 6.6              
Long-term Debt, Current Maturities 4.8     $ 4.8        
Foreign Credit Facilities [Member]                
Debt Instrument [Line Items]                
Long-term Line of Credit 107.6     107.6       $ 53.2
Debt Instrument, Unused Borrowing Capacity, Amount $ 95.1     95.1        
6.25% Notes Due 2021 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage     6.25%       6.25%  
6.25% Notes Due 2021 [Member] | Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Repurchase Amount     $ 16.9       $ 383.1  
Write off of Deferred Debt Issuance Cost       2.5        
Debt Instrument, Tender Premiums       $ 8.0        
6.625% Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage     6.625%          
6.625% Notes [Member] | Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage 6.625%     6.625%        
Debt Instrument, Repurchase Amount     $ 100.0          
Interest Paid, Including Capitalized Interest, Operating and Investing Activities     $ 0.8          
Write off of Deferred Debt Issuance Cost       $ 0.8        
Redemption Premium       $ 3.3        
7.75% Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage           7.75%    
7.75% Notes [Member] | Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage 7.75%     7.75%        
Debt Instrument, Repurchase Amount           $ 100.0    
Interest Paid, Including Capitalized Interest, Operating and Investing Activities           3.9    
Write off of Deferred Debt Issuance Cost           0.3    
Redemption Premium           $ 4.5