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Financial Instruments And Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Summary Of Carrying Values And Fair Values Of Fixed Rate Debt A summary of the aggregate carrying values and fair values of our fixed rate long-term debt is as follows:
 
June 30,
2020
 
December 31,
2019
Carrying value
$
2,090.4

 
$
1,934.1

Fair value
$
2,216.9

 
$
2,001.8
Nonfinancial Assets Measured and Recorded At Fair Value On A Nonrecurring Basis
The following table presents nonfinancial assets measured and recorded at fair value on a nonrecurring basis during the six months ended June 30, 2020 and 2019:
 
 
2020
 
2019
Description
 
Fair Value
Measurements Using Significant
Unobservable Inputs
(Level 3)
 
Gain/(Loss)
 
Fair Value
Measurements Using Significant
Unobservable Inputs
(Level 3)
 
Gain/(Loss)
Goodwill
 
$
457.5

 
$
(318.3
)
 
$
—

 
$
—

Franchise rights and other
 
$
26.2

 
$
(59.9
)
 
$
8.9

 
$
(9.6
)
Right-of-use assets
 
$
1.4

 
$
(0.4
)
 
$
0.1

 
$
(0.2
)
Long-lived assets held and used
 
$
1.8

 
$
(5.8
)
 
$
—

 
$
—

Long-lived assets held for sale in continuing
    operations
 
$
—

 
$
—

 
$
21.3

 
$
(1.1
)
Quantitative Information about Level 3 Fair Value Measurements
Quantitative Information about Level 3 Fair Value Measurements
Description
 
Fair Value at
March 31, 2020
 
Valuation Technique
 
Unobservable Input
 
Range (Average)
Franchise rights
 
$
24.6

 
Discounted cash flow
 
Weighted average cost of capital
 
8.5%
 
 
 
 
 
 
Discount rate
 
11.1% - 14.3% (12.1%)
 
 
 
 
 
 
Long-term revenue growth rate
 
2.0%
 
 
 
 
 
 
Long-term pretax income margin
 
0.6% - 2.8% (1.4%)
 
 
 
 
 
 
Contributory asset charges
 
4.2% - 12.1% (6.2%)