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Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Accumulated other comprehensive loss at beginning of period $ 6,996.2  
Accumulated other comprehensive loss at end of period 7,072.0  
Interest rate derivatives, tax 17.4 $ 19.1
Gains and Losses on Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Accumulated other comprehensive loss at beginning of period (24.1) (25.3)
Net current period other comprehensive loss 0.3 0.3
Accumulated other comprehensive loss at end of period (23.8) (25.0)
Gains and Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Other comprehensive income (loss), tax 0.0 0.0
Interest rate derivatives, tax 0.1 0.1
Amortization of net actuarial loss, tax 0.0 0.0
Gains and Losses on Cash Flow Hedges | Interest Rate Swap    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Losses reclassified from net accumulated other comprehensive loss (0.3) [1] (0.3) [2]
Defined Benefit and Postretirement Items    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Accumulated other comprehensive loss at beginning of period (2.5) (0.2)
Net current period other comprehensive loss 0.0 0.0
Accumulated other comprehensive loss at end of period (2.5) (0.2)
Defined Benefit and Postretirement Items | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Other comprehensive income (loss), tax 0.0 0.0
Interest rate derivatives, tax 0.0 0.0
Amortization of net actuarial loss, tax 0.0 0.0
Defined Benefit and Postretirement Items | Interest Rate Swap    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Losses reclassified from net accumulated other comprehensive loss 0.0 [1] 0.0 [2]
Total    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Accumulated other comprehensive loss at beginning of period (26.6) (25.5)
Net current period other comprehensive loss 0.3 0.3
Accumulated other comprehensive loss at end of period (26.3) (25.2)
Total | Interest Rate Swap    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Losses reclassified from net accumulated other comprehensive loss $ (0.3) [1] $ (0.3) [2]
[1]
Included in interest charges.
[2]
Included in interest charges.
 
 
Three Months Ended March 31, 2019
(Millions of Dollars)
 
Gains and Losses
on Cash Flow Hedges
 
Defined Benefit Pension and
Postretirement Items
 
Total
Accumulated other comprehensive loss at Jan. 1
 
$
(25.3
)
 
$
(0.2
)
 
$
(25.5
)
Losses reclassified from net accumulated other comprehensive loss:
 
 
 
 
 
 
Interest rate derivatives (net of taxes of $0.1 and $0, respectively) (a)
 
0.3

 
—

 
0.3

Net current period other comprehensive income
 
0.3

 
—

 
0.3

Accumulated other comprehensive loss at March 31
 
$
(25.0
)
 
$
(0.2
)
 
$
(25.2
)
(a) 
Included in interest charges.