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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2016
Income Tax Disclosure [Abstract]  
Schedule of components income before income taxes
For financial reporting purposes, earnings before income taxes includes the following components:
 
Year Ended December 31,
(millions)
2016
 
2015
 
2014
United States
$
38.9

 
$
21.7

 
$
23.5

Foreign
2.9

 
3.4

 
2.4

Total
$
41.8

 
$
25.1

 
$
25.9

Schedule of components of income tax expense (benefit)
The components of income tax expense (benefit) for the years ended December 31, 2016, 2015, and 2014 are as follows:
 
Year Ended December 31,
(millions)
2016
 
2015
 
2014
Current provision
 

 
 

 
 

U.S. federal
$
13.9

 
$
11.5

 
$
9.5

Foreign
1.4

 
1.2

 
0.8

State
2.6

 
1.8

 
1.6

Total current
17.9

 
14.5

 
11.9

Deferred provision
 

 
 

 
 

U.S. federal
(2.5
)
 
(4.9
)
 
(1.5
)
Foreign
(0.4
)
 
0.1

 
0.1

State
0.8

 
(4.9
)
 
(10.7
)
Total deferred
(2.1
)
 
(9.7
)
 
(12.1
)
Income tax expense (benefit)
$
15.8

 
$
4.8

 
$
(0.2
)
Schedule of significant components of the Company's deferred tax assets and liabilities
Significant components of the Company's deferred tax assets and liabilities are as follows:
 
December 31,
(millions)
2016
 
2015
Deferred tax assets
 

 
 

Net operating loss carry forwards
$
19.3

 
$
20.6

Accrued expenses
30.7

 
34.1

Accrued compensation
12.8

 
12.1

Book over tax cost unfavorable acquired lease contracts
16.1

 
20.6

Other
1.2

 
0.7

Total gross deferred tax assets
80.1

 
88.1

Less: valuation allowance
(6.6
)
 
(6.8
)
Total deferred tax assets
73.5

 
81.3

Deferred tax liabilities
 

 
 

Prepaid expenses
(0.4
)
 
(0.4
)
Undistributed foreign earnings
(0.9
)
 
(1.0
)
Tax over book depreciation and amortization
(6.4
)
 
(11.0
)
Tax over book goodwill amortization
(28.0
)
 
(28.7
)
Tax over book cost favorable acquired lease contracts
(11.9
)
 
(15.6
)
Equity investments in unconsolidated entities
(8.0
)
 
(8.8
)
Other

 
(0.1
)
Total deferred tax liabilities
(55.6
)
 
(65.6
)
Net deferred tax asset
$
17.9

 
$
15.7


Schedule of reconciliation of the Company's reported income tax provision (benefit) to the amount computed by multiplying book income/(loss) before income taxes by the statutory United States federal income tax rate
A reconciliation of the Company's reported income tax provision (benefit) to the amount computed by multiplying book income before income taxes by the statutory United States federal income tax rate is as follows:
 
Year Ended December 31,
(millions)
2016
 
2015
 
2014
Tax at statutory rate
$
14.6

 
$
8.8

 
$
9.1

Permanent differences
0.8

 
1.4

 
1.0

State taxes, net of federal benefit
1.3

 
0.3

 
0.8

Effect of foreign tax rates

 
(0.1
)
 

Minority interest
(1.0
)
 
(1.0
)
 
(1.1
)
Equity investments in unconsolidated entities

 

 
2.4

Current year adjustment to deferred taxes
1.3

 
1.5

 
(1.3
)
Recognition of tax credits
(1.4
)
 
(1.2
)
 
(1.5
)
Other
0.4

 
0.6

 
(0.5
)
 
16.0

 
10.3

 
8.9

Change in valuation allowance
(0.2
)
 
(5.5
)
 
(9.1
)
Income tax (benefit) expense
$
15.8

 
$
4.8

 
$
(0.2
)
Schedule of tax years that remain subject to examination for the Company's major tax jurisdictions
The tax years that remain subject to examination for the Company's major tax jurisdictions as of December 31, 2016 are shown below:
2013 - 2016
United States - federal income tax
2007 - 2016
United States - state and local income tax
2012 - 2016
Foreign - Canada and Puerto Rico