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Condensed Parent Company Financial Statements (Condensed Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current assets:        
Other $ 87.7 $ 95.5    
Total current assets 905.1 877.1    
Investments:        
Other 121.9 20.0    
Total investments 396.1 337.6    
Other assets 69.7 22.6    
Total assets 14,187.8 13,373.8 $ 12,495.2  
Current liabilities:        
Commercial paper 320.2 244.1    
Other 260.8 281.8    
Total current liabilities 2,149.0 1,162.0    
Other liabilities 306.4 279.3    
Common Equity:        
Retained earnings 2,346.0 2,177.0    
Shares in deferred compensation trust (11.1) (10.0)    
Total common equity 4,182.2 3,862.0 $ 3,724.1 $ 3,438.7
Total liabilities and equity 14,187.8 13,373.8    
Parent Company [Member]        
Current assets:        
Notes receivable from affiliated companies 50.0 74.0    
Other 7.0 5.0    
Total current assets 57.0 79.0    
Investments:        
Investments in consolidated subsidiaries 4,676.0 4,211.0    
Other 2.0 2.0    
Total investments 4,678.0 4,213.0    
Other assets 78.0 64.0    
Total assets 4,813.0 4,356.0    
Current liabilities:        
Commercial paper 295.0 192.0    
Notes payable to affiliated companies 305.0 275.0    
Other 12.0 12.0    
Total current liabilities 612.0 479.0    
Other liabilities 20.0 18.0    
Common Equity:        
Common stock and additional paid-in capital 1,848.0 1,695.0    
Retained earnings 2,344.0 2,174.0    
Shares in deferred compensation trust (11.0) (10.0)    
Total common equity 4,181.0 3,859.0    
Total liabilities and equity $ 4,813.0 $ 4,356.0