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Statement of Equity Statement - USD ($)
$ in Millions
Total
Common Stock [Member]
Other Additional Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Subsidiaries [Member]
Subsidiaries [Member]
Common Stock [Member]
Subsidiaries [Member]
Other Additional Capital [Member]
Subsidiaries [Member]
AOCI Attributable to Parent [Member]
Subsidiaries [Member]
Retained Earnings [Member]
Subsidiaries [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Shares, Issued   1           41,172,173        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (584.3) $ 0.0 $ 2,330.4 $ 0.8 $ (2,915.5)   $ 330.7 $ 0.4 $ 685.8 $ (36.2) $ (319.3)  
Other Comprehensive Income (Loss), Net of Tax       3.3           1.1    
Net Income (Loss) Attributable to Parent         16.9           15.7  
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 20.2           16.8          
Non-cash capital contribution 44.6   44.6                  
Stockholders' Equity, Other 0.0   (1.0) 1.0   (0.4)   (0.3) (1.1) 1.0  
Dividends, Common Stock, Cash             (23.8)   (23.8)    
Proceeds from Contributions from Parent             (80.0)   80.0      
Other Comprehensive Income (Loss), Net of Tax 3.0           2.5          
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 44.4           64.4          
Non-cash capital contribution 30.2                      
Proceeds from Contributions from Parent             (80.0)          
AOCI reclassed to Retained Earnings before tax | Adjustments for New Accounting Pronouncement [Member] 1.6           1.7          
AOCI reclassed to Retained Earnings, net of tax | Adjustments for New Accounting Pronouncement [Member] 1.0           1.1          
Shares, Issued   1           41,172,173        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (519.5) $ 0.0 2,375.0 3.1 (2,897.6)   403.3 $ 0.4 741.7 (36.2) (302.6)  
Other Comprehensive Income (Loss), Net of Tax       (0.3)     0.8          
Net Income (Loss) Attributable to Parent         3.5   15.0          
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 3.2           15.8          
Non-cash capital contribution (17.9)   (17.9)                  
Stockholders' Equity, Other $ 0.1   0.1                  
Common Stock, Shares Authorized 1,500                      
Shares, Issued   1           41,172,173        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (534.1) $ 0.0 2,357.2 2.8 (2,894.1)   419.1 $ 0.4 741.7 (35.4) (287.6)  
Other Comprehensive Income (Loss), Net of Tax 0.0           0.6          
Net Income (Loss) Attributable to Parent 21.0           31.2          
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 21.0           31.8          
Non-cash capital contribution 3.5   3.5                  
Stockholders' Equity, Other 0.1   0.1       0.1   0.1      
Dividends, Common Stock, Cash             $ (20.0)   (20.0)      
Common stock, par value (in USD per share)             $ 0.01          
Common Stock, Shares Authorized             50,000,000          
Shares, Issued   1           41,172,173        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (509.5) $ 0.0 2,360.8 2.8 (2,873.1)   $ 431.0 $ 0.4 721.8 (34.8) (256.4)  
Common stock, par value (in USD per share)             $ 0.01          
Common Stock, Shares Authorized 1,500           50,000,000          
Shares, Issued   1           41,172,173        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (471.7) $ 0.0 2,370.5 2.2 (2,844.4)   $ 445.3 $ 0.4 711.8 (35.3) (231.6)  
Other Comprehensive Income (Loss), Net of Tax       (0.4)           0.4    
Net Income (Loss) Attributable to Parent         42.1           29.0  
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 41.7           29.4          
Non-cash capital contribution 1.5   1.5                  
Stockholders' Equity, Other 0.1   0.1       (0.3)       (0.3)  
Other Comprehensive Income (Loss), Net of Tax (2.2)         $ (2.3) 1.1         $ (1.0)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 59.2           104.8          
Non-cash capital contribution 2.7                      
Proceeds from Contributions from Parent             0.0          
Shares, Issued   1           41,172,173        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (428.4) $ 0.0 2,372.1 1.8 (2,802.3)   474.4 $ 0.4 711.8 (34.9) (202.9)  
Other Comprehensive Income (Loss), Net of Tax       (0.8)           (0.9)    
Net Income (Loss) Attributable to Parent         (16.1)           29.8  
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (16.9)           28.9          
Non-cash capital contribution (1.5)   (1.5)                  
Proceeds from Contributions from Parent             70.0   (70.0)      
Shares, Issued   1           41,172,173        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (446.8) $ 0.0 2,370.6 1.0 (2,818.4)   433.3 $ 0.4 641.8 (35.8) (173.1)  
Other Comprehensive Income (Loss), Net of Tax (1.0)           1.6          
Net Income (Loss) Attributable to Parent 35.4           44.9          
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 34.4           46.5          
Non-cash capital contribution 2.7   2.7                  
Stockholders' Equity, Other $ 0.1   0.1       0.0   (0.1)   0.1  
Dividends, Common Stock, Cash             $ (20.0)   (20.0)      
Common stock, par value (in USD per share)             $ 0.01          
Common Stock, Shares Authorized 1,500           50,000,000          
Shares, Issued   1           41,172,173        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (409.6) $ 0.0 $ 2,373.4 $ 0.0 $ (2,783.0)   $ 459.8 $ 0.4 $ 621.9 $ (34.2) $ (128.3)