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Other Debt Disclosures Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]            
Write off of Deferred Debt Issuance Cost $ 4.3 $ 2.7 $ 14.6 $ 2.7    
Debt refinancing and redemption costs 15.6 $ 0.0 15.6 $ 0.0    
Long-term Debt, Current Maturities $ 33.2   $ 33.2     $ 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]            
Long-term Debt, Current Maturities $ 11.4   $ 11.4      
Foreign Credit Facilities [Member]            
Debt Instrument [Line Items]            
Long-term Line of Credit 94.8   94.8     $ 53.2
Debt Instrument, Unused Borrowing Capacity, Amount $ 94.8   $ 94.8      
6.25% Notes Due 2021 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 6.25%   6.25%   6.25%  
6.25% Notes Due 2021 [Member] | Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Repurchase Amount $ 16.9   $ 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%      
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   $ 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