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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Reconciliation of Changes in Pension Plans Benefit Obligation and Fair Value of Assets, Statement of Funded Status and Amount Recognized in Balance Sheet and Accumulated Other Comprehensive Income
The following tables provide a reconciliation of the changes in the Pension Plans’ benefit obligation and fair value of assets, the funded status of the plans and the amounts recognized in the consolidated balance sheets and AOCI as of December 31, 2016 and 2015 (in millions):
 
Pension Benefits 
 
 
Other Post-retirement
Benefits 
 
December 31, 2016
 
December 31, 2015
 
 
December 31, 2016
 
December 31, 2015
Change in Benefit Obligation:
 
 
 
 
 
 
 
 
Obligation at beginning of year
$
37.0

 
$
43.6

 
 
$
3.0

 
$
3.0

Interest cost
1.2

 
1.7

 
 
0.2

 
0.1

Actuarial loss (gain)
1.7

 
(2.0
)
 
 
(0.5
)
 
0.1

Benefit payments
(2.4
)
 
(2.8
)
 
 
(0.1
)
 
(0.2
)
Group annuity contract discontinuance
—

 
(1.3
)
 
 
—

 
—

Settlement of accumulated benefits
(2.7
)
 
(2.2
)
 
 
—

 
—

Benefit obligation at end of year
$
34.8

 
$
37.0

 
 
$
2.6

 
$
3.0

 
 
 
 

 
 
 
 
 

Change in Plan Assets:
 
 
 

 
 
 
 
 

Fair value of plan assets at beginning of year
$
32.3

 
$
40.4

 
 
$
—

 
$
—

Actual return on plan assets
1.4

 
(1.8
)
 
 
—

 
—

Employer contributions
1.9

 
—

 
 
0.1

 
0.2

Benefit payments
(2.4
)
 
(2.8
)
 
 
(0.1
)
 
(0.2
)
Group annuity contract discontinuance
—

 
(1.3
)
 
 
—

 
—

Settlement of accumulated benefits
(2.7
)
 
(2.2
)
 
 
—

 
—

Fair value of plan assets at end of year
$
30.5

 
$
32.3

 
 
$
—

 
$
—

 
 
 
 

 
 
 
 
 

Funded status at end of year
$
(4.3
)
 
$
(4.7
)
 
 
$
(2.6
)
 
$
(3.0
)
 
 
 
 
 
 
 
 
 
Amounts recognized in the balance sheet consist of:
 
 
 
 
 
 
 
 
Current liabilities
$
(4.3
)
 
$
—

 
 
$
(0.2
)
 
$
(0.2
)
Non-current liabilities
—

 
(4.7
)
 
 
(2.4
)
 
(2.8
)
Total liabilities
$
(4.3
)
 
$
(4.7
)
 
 
$
(2.6
)
 
$
(3.0
)
 
 
 
 
 
 
 
 
 
Amounts recognized in AOCI consist of:
 
 
 
 
 
 
 
 
Net actuarial loss (gain)
$
17.7

 
$
17.5

 
 
$
(0.7
)
 
$
(0.2
)
Total
$
17.7

 
$
17.5

 
 
$
(0.7
)
 
$
(0.2
)
 
 
 
 
 
 
 
 
 
Additional Information:
 
 
 
 
 
 
 
 
Accumulated benefit obligation
$
34.8

 
$
37.0

 
 
 
 
 
Schedule of Net Periodic Benefit Cost and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
The following table provides components of net periodic benefit cost and other changes in plan assets and benefit obligations recognized in other comprehensive income (in millions):
 
Pension Benefits 
 
 
Other Post-retirement
Benefits 
 
December 31,
 
 
December 31,
 
2016
 
2015
 
2014
 
 
2016
 
2015
 
2014
Net Periodic Benefit Cost:
 
 
 
 
 
 
 
 
 
 
 
 
Interest cost
$
1.2

 
$
1.7

 
$
1.8

 
 
$
0.2

 
$
0.1

 
$
0.1

Expected return on plan assets
(1.8
)
 
(2.1
)
 
(2.5
)
 
 
—

 
—

 
—

Amortization of net actuarial loss (gain)
0.6

 
0.6

 
0.4

 
 
—

 
—

 
(0.1
)
Settlement charge
1.3

 
1.6

 
—

 
 
—

 
—

 
—

Net periodic benefit cost (income)
$
1.3

 
$
1.8

 
$
(0.3
)
 
 
$
0.2

 
$
0.1

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
 
 
 
 
 
 
 
 
 
 
 
 
Net actuarial loss (gain)
$
2.1

 
$
1.9

 
$
5.2

 
 
$
(0.5
)
 
$
0.2

 
$
(0.4
)
Settlement charge
(1.3
)
 
(1.6
)
 
—

 
 
—

 
—

 
—

Amortization of actuarial (loss) gain
(0.6
)
 
(0.6
)
 
(0.4
)
 
 
—

 
—

 
0.1

Total net loss (gain) recognized in
 
 
 
 
 
 
 
 
 
 
 
 
   other comprehensive income
$
0.2

 
$
(0.3
)
 
$
4.8

 
 
$
(0.5
)
 
$
0.2

 
$
(0.3
)
Schedule of Assumptions Used
The following table shows the weighted-average assumptions used in the measurement of: 
 
Pension Benefits 
 
 
Other Post-retirement Benefits
 
December 31,
 
 
December 31,
 
2016
 
2015
 
2014
 
 
2016
 
2015
 
2014
Benefit Obligations:
 
 
 
 
 
 
 
 
 
 
 
 
Discount rate
3.30
%
 
4.32
%
 
4.00
%
 
 
3.98
%
 
4.32
%
 
3.99
%
Expected return on assets
3.25
%
 
6.00
%
 
5.50
%
 
 
N/A

 
N/A

 
N/A

 
 
 
 
 
 
 
 
 
 
 
 
 
Net Periodic Benefit Costs:
 
 
 
 
 
 
 
 
 
 
 
 
Discount rate
4.13
%
 
4.05
%
 
4.60
%
 
 
4.29
%
 
3.99
%
 
4.6
%
Expected return on assets
3.57
%
 
5.95
%
 
6.55
%
 
 
3.47
%
 
N/A

 
N/A
Schedule of Health Care Cost Trend Rates
The health care cost trend rates assumed for the end of year benefit obligation for the post-retirement benefit plans are as follows: 
 
December 31, 2016
 
December 31, 2015
Assumed current trend rate for next year for participants under 65
6.62%
 
6.80%
Assumed current trend rate for next year for participants 65 and over
7.73%
 
7.85%
Ultimate year trend rate
4.50%
 
5.00%
Year that ultimate trend rate is reached for participants under 65
2025
 
2024
Year that ultimate trend rate is reached for participants 65 and over
2025
 
2023
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
A one percent point change in assumed health care cost trend rates would have the following effects (in millions): 
 
1% Increase
 
1% Decrease
Effect on total of service and interest cost components of net periodic post-retirement
 
 
 
health care benefit cost
$
—

 
$
—

Effect on the health care component of the accumulated post-retirement benefit
 
 
 
obligation
$
0.2

 
$
0.3
Schedule of Fair Value of Plan Assets
The fair value measurements of the Pension Plans’ assets by asset category at December 31, 2015 are as follows (in millions):
Asset Category
Total
 
Investments Measured at Net Asset Value
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
Cash and cash equivalents
$
1.0


$
—


$
1.0


$
—


$
—

Group trust
31.3


31.3


—


—


—

 Total
$
32.3


$
31.3


$
1.0


$
—


$
—

The fair value measurements of the Pension Plans’ assets by asset category at December 31, 2016 are as follows (in millions):
Asset Category
Total
 
Investments Measured at Net Asset Value
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
Cash and cash equivalents
$
1.6


$
—


$
1.6


$
—


$
—

Group trust
28.9


28.9


—


—


—

 Total
$
30.5


$
28.9


$
1.6


$
—


$
—
Schedule of Expected Benefit Payments
Estimated future benefit payments reflecting future service are as follows (in millions):
Year ending December 31, 
Pension Benefits
 
Other
Post-retirement Benefits
2017
$
35.8

 
$
0.2

2018
—

 
0.2

2019
—

 
0.2

2020
—

 
0.2

2021
—

 
0.2

2021 through 2025
—

 
0.9
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year
Expected amortization from AOCI into net periodic benefit cost for the year ending December 31, 2017 (in millions):
 
Pension Benefits
 
Other
Post-retirement  Benefits
Expected amortization of net actuarial loss
$
0.7

 
$
(0.1
)