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Employee Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Schedule of actuarial assumptions
Actuarial Assumptions
 
Year Ended December 31,
 
2012
 
2011
 
2010
Assumptions used to determine benefit obligations at the annual measurement date were:
 
 
 
 
 
Obligation discount rate
4.25%
 
5.40%
 
5.90%
Compensation increase rate
4.00%
 
3.00%
 
3.00%
Assumptions used to determine net periodic benefit costs were:
 
 
 
 
 
Obligation discount rate
5.40%
 
5.90%
 
6.10%
Long-term rate of return on plan assets
7.75%
 
7.75%
 
7.75%
Compensation increase rate
3.00%
 
3.00%
 
3.00%
Components of net retirement cost
Components of Net Retirement Cost
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(in millions)
Expense Components
 
 
 
 
 
Service cost
$
0.9

 
$
0.8

 
$
0.9

Interest
19.4

 
19.6

 
18.7

Expected return on plan assets
(22.9
)
 
(22.8
)
 
(20.1
)
Amortization and deferral:
 
 
 
 
 
Actuarial loss
3.2

 
1.8

 
1.9

Prior service cost
0.1

 
0.1

 
0.1

Other
—

 
—

 
0.2

Defined benefit expense
0.7

 
(0.5
)
 
1.7

Profit sharing
11.9

 
9.3

 
8.3

Net expense
$
12.6

 
$
8.8

 
$
10.0
Obligations and funded status
Obligations and Funded Status
 
Year Ended December 31,
 
2012
 
2011
 
(in millions)
Accumulated Benefit Obligations
$
442.5

 
$
364.8

Projected Benefit Obligations:
 
 
 
Beginning of year
$
364.8

 
$
335.8

Service cost
0.9

 
0.8

Interest
19.4

 
19.6

Benefits paid
(13.3
)
 
(14.7
)
Actuarial loss
70.7

 
23.3

End of year
$
442.5

 
$
364.8

Plans' Assets:
 
 
 
Beginning of year
$
290.6

 
$
291.1

Actual return on assets
45.5

 
(1.2
)
Employer contributions
17.3

 
15.4

Benefits paid
(13.3
)
 
(14.7
)
End of year
$
340.1

 
$
290.6

Consolidated Balance Sheet Components:
 
 
 
Funded status
$
(102.4
)
 
$
(74.2
)
Percent of projected benefit obligations funded
76.9
%
 
79.7
%
Amounts recognized in other comprehensive income (loss)
Amounts Recognized in Other Comprehensive Income (Loss)
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(in millions)
Actuarial gain (loss)
$
(48.1
)
 
$
(47.3
)
 
$
11.9

Amortization of actuarial loss
3.2

 
1.7

 
1.9

Amortization of prior service cost
0.1

 
0.1

 
0.1

Other
—

 
—

 
(0.2
)
Settlements
—

 
—

 
0.2

Total before income taxes
(44.8
)
 
(45.5
)
 
13.9

Income tax expense (benefit)
(16.7
)
 
(16.9
)
 
5.2

Net amount recognized in other comprehensive income (loss)
$
(28.1
)
 
$
(28.6
)
 
$
8.7
Estimated fair value of plan assets and target asset allocations
The estimated fair value of plan assets at year end 2012 and 2011, indicating input levels used to determine fair value, and the range of target asset allocations are as follows:
 
Target
Allocation
 
December 31,
2012
 
December 31,
2011
Cash and cash equivalents 
 
 
1
%
 
3
%
Equity securities
60-80%
 
73

 
66

Debt securities
20-40%
 
26

 
31

Total
 
 
100
%
 
100
%

 
Fair Value Measurement as of December 31, 2012
 
(in millions)
 
Level 1
 
Level 2
 
Level 3
 
Total
 
 
Temporary cash investments
$
3.3

 
$
—

 
$
—

 
$
3.3

Common trust funds
—

 
336.8

 
—

 
336.8

 
$
3.3

 
$
336.8

 
$
—

 
$
340.1

 
Fair Value Measurement as of December 31, 2011
 
(in millions)
 
Level 1
 
Level 2
 
Level 3
 
Total
 
 
Temporary cash investments
$
9.7

 
$
—

 
$
—

 
$
9.7

Common trust funds
—

 
207.4

 
—

 
207.4

Registered investment companies
73.5

 
—

 
—

 
73.5

 
$
83.2

 
$
207.4

 
$
—

 
$
290.6
Schedule of expected benefit payments
Benefit payments expected to be paid during the next ten years are as follows:
 
Years ending December 31,
 
(in millions)
2013
$
15.8

2014
16.8

2015
18.0

2016
19.2

2017
20.6

2018-2022
122.5