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Debt (Schedule of Extinguishment of Debt - Exchange Offers) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 05, 2017
Oct. 01, 2016
Dec. 31, 2011
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount           $ 24.5  
Gain (Loss) on Extinguishment of Debt   $ 287.8 $ (33.5) $ 0.0      
Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount   1,130.6       $ 24.5  
Debt Instrument, Repurchase Amount   863.9          
Senior Notes [Member] | 8.50% Senior notes due 2019              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount   62.0          
Debt Instrument, Face Amount             $ 500.0
Debt Instrument, Repurchase Amount   55.7          
Senior Notes [Member] | 6.875% Senior notes due 2020              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount   219.2          
Debt Instrument, Face Amount             900.0
Debt Instrument, Repurchase Amount   181.5          
Senior Notes [Member] | 4.70% Senior notes due 2021              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount   817.0          
Debt Instrument, Face Amount             $ 1,500.0
Debt Instrument, Repurchase Amount   $ 609.0          
Scenario, Forecast [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Amount Paid in Cash [1]         $ 332.5    
Gain (Loss) on Extinguishment of Debt $ (6.0)            
Scenario, Forecast [Member] | 8.50% Senior notes due 2019              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Amount Paid in Cash         81.7    
Scenario, Forecast [Member] | 6.875% Senior notes due 2020              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Amount Paid in Cash         69.4    
Scenario, Forecast [Member] | 4.70% Senior notes due 2021              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Amount Paid in Cash         181.4    
Scenario, Forecast [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount         649.5    
Debt Instrument, Repurchase Amount         664.5    
Scenario, Forecast [Member] | Senior Notes [Member] | 8.50% Senior notes due 2019              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount [2]         145.8    
Debt Instrument, Repurchase Amount         163.3    
Scenario, Forecast [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    
Scenario, Forecast [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount [2]         129.8    
Debt Instrument, Repurchase Amount         138.7    
Scenario, Forecast [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    
Scenario, Forecast [Member] | Senior Notes [Member] | 4.70% Senior notes due 2021              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount [2]         373.9    
Debt Instrument, Repurchase Amount         362.5    
Scenario, Forecast [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    
Scenario, Forecast [Member] | Senior Notes [Member] | 8.00% Senior notes due 2024              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount         $ 332.0    
[1] As of December 31, 2016, the aggregate amount of principal repurchased with cash of $332.5 million, along with associated premiums, was classified as current maturities of long-term debt on our consolidated balance sheet. During the first quarter, we expect to recognize a pre-tax loss on the Exchange Offers of approximately $6.0 million, net of premiums and transaction costs.
[2] As of December 31, 2016, the aggregate amount of principal repurchased with cash of $332.5 million, along with associated premiums, was classified as current maturities of long-term debt on our consolidated balance sheet.