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Debt (Schedule of Extinguishment of Debt - Exchange Offers) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Mar. 31, 2017
Jan. 05, 2017
Dec. 31, 2016
Dec. 31, 2011
Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Face Amount $ 194.1     $ 1,130.6  
Debt Instrument, Repurchase Amount 204.5     863.9  
Senior Notes [Member] | 8.50% Senior notes due 2019          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Face Amount 54.6 $ 145.8   62.0  
Debt Instrument, Face Amount         $ 500.0
Debt Instrument, Repurchase Amount 60.1     55.7  
Senior Notes [Member] | 6.875% Senior notes due 2020          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Face Amount 100.1 129.8   219.2  
Debt Instrument, Face Amount         900.0
Debt Instrument, Repurchase Amount 105.1     181.5  
Senior Notes [Member] | 4.70% Senior notes due 2021          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Face Amount 39.4 373.9   817.0  
Debt Instrument, Face Amount         $ 1,500.0
Debt Instrument, Repurchase Amount 39.3     $ 609.0  
Senior Notes [Member] | 8.00% Senior notes due 2024          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 332.0 $ 332.0      
Exchange Offers [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Amount Paid in Cash     $ 332.5    
Exchange Offers [Member] | 8.50% Senior notes due 2019          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Amount Paid in Cash     81.7    
Exchange Offers [Member] | 6.875% Senior notes due 2020          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Amount Paid in Cash     69.4    
Exchange Offers [Member] | 4.70% Senior notes due 2021          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Amount Paid in Cash     181.4    
Exchange Offers [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Face Amount     649.5    
Debt Instrument, Repurchase Amount     664.5    
Exchange Offers [Member] | Senior Notes [Member] | 8.50% Senior notes due 2019          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Face Amount     145.8    
Debt Instrument, Repurchase Amount     163.3    
Exchange Offers [Member] | Senior Notes [Member] | 8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     81.6    
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Face Amount     129.8    
Debt Instrument, Repurchase Amount     138.7    
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020 exchanged for 8.00% Senior notes due 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     69.3    
Exchange Offers [Member] | Senior Notes [Member] | 4.70% Senior notes due 2021          
Debt Instrument [Line Items]          
Debt Instrument, Repurchased Face Amount     373.9    
Debt Instrument, Repurchase Amount     362.5    
Exchange Offers [Member] | Senior Notes [Member] | 4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     181.1    
Exchange Offers [Member] | Senior Notes [Member] | 8.00% Senior notes due 2024          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     $ 332.0