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Debt and Other Financing Arrangements Debt and Other Financing Arrangements - Notes due (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 1993
USD ($)
Oct. 06, 2017
USD ($)
Debt Instrument [Line Items]                    
Proceeds from Issuance of Long-term Debt           $ 943.0 $ 635.0 $ 0.0    
Loss (Gain) on Extinguishment of Debt $ 3.2 $ 4.8 $ 11.4 $ 5.2 $ 2.4 $ (3.2) (19.0) (20.9)    
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, Covenant Description           35        
Debt Instrument, Redemption Price, Redemption Period           180 days        
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, Face Amount                   $ 350.0
Days of Interest Accrual                   30
Number of Business Days to Deposit Cash in Escrow Account                   5
Debt Instrument, Percentage, Redemption Price                   1.00
Debt Instrument, Redemption Price, Redemption Period           180 days        
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         $ 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 $ 13.7    
Debt Instrument, Redemption Price, Percentage             100.75% 99.853%    
Loss (Gain) on Extinguishment of Debt             $ 0.1 $ 0.1