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INCOME TAXES (Tables)
 3 Months Ended
Mar. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of effective income tax rate reconciliation

The provision for income taxes differs from the amount of income tax determined by applying the applicable United States statutory federal income tax rate to income before income taxes as a result of the following:
 
 
Three Months Ended March 31, 2020
 
Three Months Ended March 31, 2019
(in millions)
 
Amount
 
Effective Tax Rate
 
Amount
 
Effective Tax Rate
Statutory federal income tax
 
$
113.9

 
21.0
 %
 
$
101.9

 
21.0
 %
State income taxes net of federal tax benefit
 
34.0

 
6.3
 %
 
31.0

 
6.4
 %
Federal excess deferred tax amortization – Wisconsin unprotected
 
(22.1
)
 
(4.1
)%
 
—

 
—
 %
Wind production tax credits
 
(18.4
)
 
(3.4
)%
 
(13.4
)
 
(2.8
)%
Federal excess deferred tax amortization
 
(13.0
)
 
(2.4
)%
 
(13.2
)
 
(2.7
)%
Excess tax benefits – stock options
 
(4.9
)
 
(0.9
)%
 
(7.2
)
 
(1.5
)%
Tax repairs
 
1.5

 
0.3
 %
 
(29.6
)
 
(6.1
)%
Other
 
(1.0
)
 
(0.2
)%
 
(4.5
)
 
(0.9
)%
Total income tax expense
 
$
90.0

 
16.6
 %
 
$
65.0

 
13.4
 %