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Debt and Other Financing (Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2009
Mar. 31, 2008
Jun. 30, 2003
Notes payable $ 50.4 $ 116.0          
Current portion of long-term debt 4.8 5.7          
Total debt maturing within one year 55.2 121.7          
Total 2,106.3 2,355.0          
Amortization of swap termination 58.1 79.4          
Less current portion (4.8) (5.7)          
Total long-term debt 2,159.6 2,428.7          
Letters of credit outstanding 12.9 12.9          
Two Point Three Seven Five Percent Notes, Due March Two Thousand Sixteen [Member]              
Notes 0.0 249.9          
Interest rate, stated percentage     2.375% 2.375%      
Five Point Seven Five Percent Notes, Due March Two Thousand Eighteen [Member]              
Notes 249.8 249.7          
Interest rate, stated percentage           5.75%  
Four Point Two Percent Notes, Due July Two Thousand Eighteen [Member]              
Notes 249.8 249.7          
Interest rate, stated percentage             4.20%
Six Point Five Percent Notes, Due March Two Thousand Nineteen [Member]              
Notes 348.6 348.2          
Interest rate, stated percentage         6.50%    
Other, payable through 2024 with interest from .6% to 7.4% [Member]              
Other debt $ 12.7 12.8          
Interest rate, stated percentage, minimum 0.40%            
Interest rate, stated percentage, maximum 7.80%            
Four Point Six Zero Percent Notes, Due March Two Thousand Twenty [Member]              
Notes $ 499.6 499.4          
Interest rate, stated percentage     4.60%        
Five Point Zero Percent Notes, Due March Two Thousand Twenty-Three [Member]              
Notes 496.5 496.0          
Interest rate, stated percentage     5.00%        
Six Point Nine Five Percent Notes, Due March Two Thousand Forty-Three [Member]              
Notes $ 249.3 $ 249.3          
Interest rate, stated percentage     6.95%