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Other Debt Disclosures Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Apr. 12, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Write off of Deferred Debt Issuance Cost $ 10.3 $ 0.0    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 5.80%     5.70%
Foreign Credit Facilities [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit $ 81.2     $ 53.2
Debt Instrument, Unused Borrowing Capacity, Amount $ 135.8      
6.25% Notes Due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.25%      
6.25% Notes Due 2021 [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.25%      
Debt Instrument, Repurchase Amount $ 383.1      
Write off of Deferred Debt Issuance Cost 2.5      
Debt Instrument, Tender Premiums $ 7.8      
Subsequent Event [Member] | 6.25% Notes Due 2021 [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Repurchase Amount     $ 16.9