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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2019
Income Taxes  
Schedule of income tax benefit (expense)

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Year ended December 31, 

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2019

    

2018

    

2017

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(in millions)

Current tax (expense) benefit

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​

​

​

​

​

​

​

Federal

​

$

—

​

$

8.8

​

$

(5.7)

State

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2.8

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(1.0)

​

 

(11.9)

Total Current

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2.8

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7.8

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(17.6)

Deferred tax (expense) benefit

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​

​

​

​

​

​

​

​

Federal

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(8.1)

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44.8

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179.6

State

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3.8

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12.5

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(3.7)

Total Deferred

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(4.3)

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57.3

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175.9

Income tax (expense) benefit, net

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$

(1.5)

​

$

65.1

​

$

158.3

Schedule of reconciliation of income tax provision computed at statutory tax rates to effective tax rate

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Year ended December 31, 

​

    

2019

    

2018

    

2017

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(in millions)

Statutory federal income taxes

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$

(8.0)

​

$

32.0

​

$

(9.5)

State income taxes

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(2.1)

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11.9

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(1.6)

Uncertain tax positions

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3.7

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(0.1)

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(3.2)

Tax status & tax rate change

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0.9

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1.3

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4.0

Other true-ups

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0.8

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1.0

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1.2

Equity compensation

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(0.3)

​

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(1.9)

​

​

—

Other permanent differences

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(0.4)

​

 

(0.3)

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(0.5)

Goodwill impairment

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​

—

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(11.2)

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(35.1)

Corporate Tax Reform

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​

—

​

​

—

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103.4

Change in valuation allowance

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3.9

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32.4

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99.6

Income tax benefit, net

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$

(1.5)

​

$

65.1

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$

158.3

Schedule of components of deferred tax assets and deferred tax liabilities

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December 31, 

​

    

2019

    

2018

​

 

(in millions)

Non-current deferred income tax (assets) liabilities:

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​

​

​

​

​

Allowances and other reserves

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$

(6.8)

​

$

(7.1)

Net operating loss carryforwards

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(203.7)

​

 

(172.8)

Depreciation and amortization

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183.9

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140.5

Franchise operating rights

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202.0

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204.7

Interest hedging

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(4.8)

​

​

—

Debt issuance costs

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​

2.5

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3.2

State income tax

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(0.9)

​

​

(1.9)

Other

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(6.4)

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(4.1)

Valuation allowance

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26.7

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30.4

Total net deferred tax liabilities

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$

192.5

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$

192.9

Schedule of reconciliation of unrecognized tax benefits

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​

​

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Year ended December 31, 

​

    

2019

    

2018

    

2017

​

​

(in millions)

Unrecognized tax benefits—January 1st

​

$

28.0

​

$

30.9

​

$

31.5

Gross increases—tax positions in prior period

​

 

—

​

 

—

​

 

3.8

Gross decreases—tax positions in prior period

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(12.8)

​

 

(2.9)

​

 

(2.6)

Gross increases—tax positions in current period

​

 

—

​

 

—

​

 

14.2

Settlements

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(3.8)

​

 

—

​

 

(1.2)

Gross change related to Tax Reform

​

​

—

​

​

—

​

​

(14.8)

Unrecognized tax benefits—December 31st

​

$

11.4

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$

28.0

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$

30.9