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Debt and Other Financing (Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2013
Jun. 30, 2009
Mar. 31, 2008
Jun. 30, 2003
Notes payable $ 22.6 $ 13.5        
Current portion of long-term debt 3.1 4.6        
Total debt maturing within one year 25.7 18.1        
Senior Notes 492.6 491.0        
Total 1,869.3 1,869.5        
Amortization of swap termination 6.0 10.9        
Less current portion (3.1) (4.6)        
Total long-term debt 1,872.2 1,875.8        
Two Point Three Seven Five Percent Notes, Due March Two Thousand Sixteen [Member]            
Interest rate, stated percentage     2.375%      
Five Point Seven Five Percent Notes, Due March Two Thousand Eighteen [Member]            
Interest rate, stated percentage         5.75%  
Four Point Two Percent Notes, Due July Two Thousand Eighteen [Member]            
Interest rate, stated percentage           4.20%
Six Point Five Percent Notes, Due March Two Thousand Nineteen [Member]            
Interest rate, stated percentage       6.50%    
Notes 237.2 236.8        
Other debt, payable through 2020 with interest from .4% to 11.3%            
Other debt, payable through 2025 with interest from .5% to 11.3% 5.2 9.0        
Four Point Six Zero Percent Notes, Due March Two Thousand Twenty [Member]            
Interest rate, stated percentage     4.60%      
Notes 408.8 408.2        
Five Point Zero Percent Notes, Due March Two Thousand Twenty-Three [Member]            
Interest rate, stated percentage     5.00%      
Notes 484.5 483.7        
Six Point Nine Five Percent Notes, Due March Two Thousand Forty-Three [Member]            
Interest rate, stated percentage     6.95%      
Notes $ 241.0 $ 240.8        
Minimum [Member] | Other debt, payable through 2020 with interest from .4% to 11.3%            
Interest rate, stated percentage 0.50%          
Maximum [Member] | Other debt, payable through 2020 with interest from .4% to 11.3%            
Interest rate, stated percentage 11.30%