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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Retirement Plans  
Summary of estimated future benefits to be paid for the Company's defined benefit pension plans and post-retirement medical plan

 

 
   Defined Benefit
Retirement Plan		   Post-Retirement
Medical Plan		  
In millions
 
Year
 

2014

   $ 17.2   $ 0.2  

2013

     16.1     0.2  

2012

     15.1     0.2  

2011

     15.0     0.2  

2010

     14.7     0.2  

2019 - 2023

     67.5     0.9  
           
​ ​ ​ ​ ​ ​ ​ ​
Schedule of breakdown of shares held by ESOP

 

In millions
  2013   2012   2011  

Shares held by the ESOP

     1.7     1.8     1.9  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Defined Benefit Plans
  
Retirement Plans  
Schedule of reconciliation of the beginning and ending balances of the projected pension benefit obligation, the fair value of the plan assets and the ending accumulated benefit obligation

 

In millions
  2013   2012  

Funded status

              

Projected benefit obligation

              

Beginning of year

   $ 207.3   $ 214.8  

Change in benefit obligation:

              

Service cost

     5.1     4.7  

Interest cost

     8.1     9.8  

Actuarial (gain)/loss

     (5.6 )   6.5  

Settlement due to divestiture

     (18.6 )   —  

Benefits paid

     (16.6 )   (28.5 )
           
​ ​ ​ ​ ​ ​ ​ ​

End of year

     179.7     207.3  
           
​ ​ ​ ​ ​ ​ ​ ​

Fair value of plan assets

              

Beginning of year

     209.6     211.7  

Change in plan assets:

              

Actual return on plan assets

     (0.8 )   21.2  

Company contributions

     1.3     5.2  

Foreign Currency

     (0.2 )   —  

Benefits paid

     (16.6 )   (28.5 )
           
​ ​ ​ ​ ​ ​ ​ ​

Sub Total

     193.3     209.6  
           
​ ​ ​ ​ ​ ​ ​ ​

Due to AIP (estimate)

     (19.8 )   —  
           
​ ​ ​ ​ ​ ​ ​ ​

End of year

     173.5     209.6  
           
​ ​ ​ ​ ​ ​ ​ ​

(Unfunded) funded status end of year

   $ (6.2 ) $ 2.3  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           

Accumulated benefit obligation at end of year

   $ 175.0   $ 202.3  
           
​ ​ ​ ​ ​ ​ ​ ​
Schedule of fair value of the plans' assets by asset category

Fair Value Measurements at December 31, 2013

Asset Category (in millions)
  Quoted Prices in
Active Markets
for Identical
Assets (Level 1)		   Significant
Observable
Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		   Total  

Cash

   $ 0.6   $ —   $ —   $ 0.6  

Mutual funds :

                          

Equity mutual funds(1)

   $ 23.8   $ —   $ —     23.8  

Fixed income mutual funds(2)

     168.9     —     —     168.9  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Sub Total

   $ 193.3   $ —   $ —   $ 193.3  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Due to AIP (estimate)

   $ (19.8 ) $ —   $ —     (19.8 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 173.5   $ —   $ —   $ 173.5  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Fair Value Measurements at December 31, 2012

Asset Category (in millions)
  Quoted Prices in
Active Markets
for Identical
Assets (Level 1)		   Significant
Observable
Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		   Total  

Cash

         $ —   $ —   $ —  

Mutual funds:

                          

Equity mutual funds(1)

   $ 24.6   $ 1.5   $ —     26.1  

Fixed income mutual funds(2)

     174.3     9.2     —     183.5  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 198.9   $ 10.7   $ —   $ 209.6  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
(1)
This category is comprised of investments in mutual funds that invest in equity securities such as large publicly traded companies listed in the S&P 500 Index; small to medium sized companies with market capitalization in the range of the Russell 2500 Index; and foreign issuers in emerging markets.

(2)
This category is comprised of investments in mutual funds that invest in U.S. corporate and government fixed income securities, including asset-backed securities; high yield fixed income securities primarily rated BB, B, CCC, CC, C and D; and US dollar denominated debt securities of government, government related and corporate issuers in emerging market countries.
Schedule of net asset (liability)

 

In millions
  2013   2012  

Noncurrent assets

   $ 11.4   $ 22.6  

Current liabilities

     (1.0 )   (1.0 )

Noncurrent liabilities

     (16.6 )   (19.3 )
           
​ ​ ​ ​ ​ ​ ​ ​

Asset (liability) at end of year

   $ (6.2 ) $ 2.3  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Components of net periodic benefit cost

 

In millions
  2013   2012   2011  

Service cost

   $ 5.1   $ 4.7   $ 5.2  

Interest cost

     8.1     9.8     10.7  

Expected return on plan assets

     (12.2 )   (14.1 )   (14.7 )

Settlement cost

     8.9     5.6     —  

Foreign Currency

     —     —     (0.1 )

Amortization of unrecognized net loss

     6.5     4.9     4.6  

Amortization of unrecognized prior service credit

     0.3     0.1     (0.1 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net periodic benefit cost

   $ 16.7   $ 11.0   $ 5.6  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Schedule of weighted-average assumptions for benefit obligations

 

 

 
   2013   2012  

Discount rate

     4.43 %   4.02 %

Rate of compensation increase

     3.46 %   3.46 %

Expected long-term return on plan assets

     6.45 %   6.53 %
Schedule of weighted-average assumptions for net periodic benefit cost

 

 
   2013   2012   2011  

Discount rate

     3.77 %   4.77 %   5.14 %

Rate of compensation increase

     4.29 %   4.29 %   4.29 %

Expected long-term return on plan assets

     6.50 %   7.00 %   7.00 %
Post-retirement Welfare Plans
  
Retirement Plans  
Schedule of projected post-retirement benefit obligation

 

In millions
  2013   2012   2011  

Benefit obligation at beginning of year

   $ 4.5   $ 4.0   $ 3.9  

Interest cost

     0.2     0.2     0.2  

Participant contributions

     —     0.1     0.2  

Actuarial loss

     (0.9 )   0.7     0.1  

Benefits paid

     (0.1 )   (0.5 )   (0.4 )

Settlement due to divestiture

     (1.2 )   —     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Benefit obligation at end of year

   $ 2.5   $ 4.5   $ 4.0  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Schedule of net asset (liability)

 

In millions
  2013   2012  

Current liabilities

   $ (0.2 ) $ (0.4 )

Noncurrent liabilities

     (2.3 )   (4.1 )
           
​ ​ ​ ​ ​ ​ ​ ​

Liability at end of year

   $ (2.5 ) $ (4.5 )
           
​ ​ ​ ​ ​ ​ ​ ​
Components of net periodic benefit cost

 

In millions
  2013   2012   2011  

Interest cost

   $ 0.2   $ 0.2   $ 0.2  

Amortization of prior service cost

     0.1     0.1     0.1  

Amortization of unrecognized net obligation

     0.1     0.2     0.1  

Settlement/Curtailment expense

     0.3     —     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net periodic benefit cost

   $ 0.7   $ 0.5   $ 0.4  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​