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Debt and Other Financing Arrangements Debt and Other Financing Arrangements - Notes due (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 1993
Oct. 06, 2017
Debt Instrument [Line Items]                
Proceeds from Issuance of Long-term Debt       $ 0.0 $ 943.0 $ 635.0    
Loss (Gain) on Extinguishment of Debt $ 1.3     $ 1.3 $ 3.2 19.0    
Senior Notes Due 2024 [Member]                
Debt Instrument [Line Items]                
Proceeds from Issuance of Long-term Debt   $ 200.0 $ 425.0          
Issuance of Long-Term Debt, Original Issue Premium, Percentage   105.00%            
Debt Instrument, Redemption Price, Redemption Period       180 days        
Debt Instrument, Covenant Description       35        
8% Senior Notes due 2025 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       100.00%        
Debt Instrument, Redemption Price, Percentage Of Principal Amount Outstanding       60.00%        
Debt Instrument, Redemption Price, Redemption Period       180 days        
Debt Instrument, Face Amount               $ 350.0
8% Senior Notes due 2025 [Member] | Debt Instrument, Redemption, Period One [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       108.00%        
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed       40.00%        
8% Senior Notes due 2025 [Member] | Debt Instrument, Redemption, Period Two [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       106.00%        
8% Senior Notes due 2025 [Member] | Debt Instrument, Redemption, Period Three [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       104.00%        
8% Senior Notes due 2025 [Member] | Debt Instrument, Redemption, Period Four [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       102.00%        
8% Senior Notes due 2025 [Member] | Debt Instrument, Redemption, Period Five [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       100.00%        
Senior Notes due 2023 [Member]                
Debt Instrument [Line Items]                
Proceeds from Issuance of Long-term Debt             $ 50.0  
Customary Events of Default Amount for Existing Debt Instruments       $ 20.0        
Senior Notes Due 2024 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage Of Principal Amount Outstanding       60.00%        
Senior Notes Due 2024 [Member] | Debt Instrument, Redemption, Period One [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       107.00%        
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed       40.00%        
Senior Notes Due 2024 [Member] | Debt Instrument, Redemption, Period Two [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       105.25%        
Senior Notes Due 2024 [Member] | Debt Instrument, Redemption, Period Three [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       103.50%        
Senior Notes Due 2024 [Member] | Debt Instrument, Redemption, Period Four [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       101.75%        
Senior Notes Due 2024 [Member] | Debt Instrument, Redemption, Period Five [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage       100.00%        
Senior Notes due 2023 [Member]                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount           $ 4.0    
Debt Instrument, Redemption Price, Percentage           100.75%    
Loss (Gain) on Extinguishment of Debt           $ 0.1