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Debt and Other Financing (Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Aug. 31, 2016
Mar. 31, 2013
Mar. 31, 2009
Mar. 31, 2008
Debt Instrument [Line Items]            
Notes payable $ 8.8 $ 22.6        
Current portion of long-term debt 3.2 3.1        
Debt, Current 12.0 25.7        
Senior Notes 494.2 492.6        
Total 1,584.8 1,869.3        
Amortization of swap termination 0.0 6.0        
Less current portion (3.2) (3.1)        
Total long-term debt 1,581.6 1,872.2        
6.50% Notes, due March 2019            
Debt Instrument [Line Items]            
Interest rate, stated percentage         6.50% 6.50%
Notes 0.0 237.2        
4.60% Notes, due March 2020            
Debt Instrument [Line Items]            
Interest rate, stated percentage       4.60%    
Notes 386.4 408.8        
7.875% Notes, due August 2022            
Debt Instrument [Line Items]            
Interest rate, stated percentage     7.875%      
5.00% Notes, due March 2023            
Debt Instrument [Line Items]            
Interest rate, stated percentage       5.00%    
Notes 458.5 484.5        
Other debt, payable through 2025 with interest from .4% to 12.1%            
Debt Instrument [Line Items]            
Other debt, payable through 2025 with interest from .4% to 12.1% 4.6 5.2        
6.95% Notes, due March 2043            
Debt Instrument [Line Items]            
Interest rate, stated percentage       6.95%    
Notes $ 241.1 $ 241.0        
Minimum | Other debt, payable through 2025 with interest from .4% to 12.1%            
Debt Instrument [Line Items]            
Interest rate, stated percentage 0.40%          
Maximum | Other debt, payable through 2025 with interest from .4% to 12.1%            
Debt Instrument [Line Items]            
Interest rate, stated percentage 12.10%