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Debt (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Mar. 31, 2013
Jun. 30, 2009
Mar. 31, 2008
Jun. 30, 2003
Debt Instrument [Line Items]            
Amount outstanding under revolving credit facility   $ 0.0        
Standby letters of credit, recorded liability   38.0        
Revolving credit facility draw down amount without violating covenant   $ 335.0        
Credit ratings   Our long-term credit ratings are Ba3 (Negative Outlook) for corporate family debt, and B1 (Negative Outlook) for senior unsecured debt, with Moody's; B (Stable Outlook) with S&P; and B+ (Negative Outlook) with Fitch, which are below investment grade.        
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of credit facility   $ 400.0        
Debt Instrument, Interest Rate Terms Borrowings under the 2015 facility bear interest, at our option, at a rate per annum equal to LIBOR plus 250 basis points or a floating base rate plus 150 basis points, in each case subject to adjustment based upon a leverage-based pricing grid.          
2013 Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate Terms   The indenture governing the 2013 Notes contains interest rate adjustment provisions depending on the long-term credit ratings assigned to the 2013 Notes with S&P and Moody's. As described in the indenture, the interest rates on the 2013 Notes increase by .25% for each one-notch downgrade below investment grade on each of our long-term credit ratings assigned to the 2013 Notes by S&P or Moody's. These adjustments are limited to a total increase of 2% above the respective interest rates in effect on the date of issuance of the 2013 Notes.        
Six Point Five Percent Notes Due March Two Thousand Nineteen [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount       $ 350.0    
Debt Instrument, Interest Rate, Stated Percentage       6.50%    
Five Point Seven Five Percent Notes, Due March Two Thousand Eighteen [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount         $ 250.0  
Debt Instrument, Interest Rate, Stated Percentage         5.75%  
Four Point Two Percent Notes, Due July Two Thousand Eighteen [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount           $ 250.0
Debt Instrument, Interest Rate, Stated Percentage           4.20%
2013 Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Increase (Decrease)   2.00%        
Four Point Six Zero Percent Notes, Due March Two Thousand Twenty [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 500.0      
Debt Instrument, Interest Rate, Stated Percentage     4.60%      
Five Point Zero Percent Notes, Due March Two Thousand Twenty-Three [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 500.0      
Debt Instrument, Interest Rate, Stated Percentage     5.00%      
Six Point Nine Five Percent Notes, Due March Two Thousand Forty-Three [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 250.0      
Debt Instrument, Interest Rate, Stated Percentage     6.95%