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Retirement and Other Postretirement Benefit Plans (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair value of pension assets    
Fair value measurements $ 149.3 $ 128.3
Reconciliation of Level 3 Assets    
Fair value of plan assets - beginning of year 128.3  
Fair value of plan assets - end of year 149.3 128.3
Total plan assets invested in active corporate bond funds (as a percent) 100.00% 100.00%
Target allocations by asset class (as a percent) 100.00% 100.00%
Equity funds
    
Fair value of pension assets    
Fair value measurements 83.3 70.0
Reconciliation of Level 3 Assets    
Fair value of plan assets - end of year 83.3 70.0
U.K. Equity Fund
    
Reconciliation of Level 3 Assets    
Total plan assets invested in active corporate bond funds (as a percent) 28.10% 28.00%
Target allocations by asset class (as a percent) 30.60% 28.60%
Total invested in equities (as a percent) 50.00%  
Overseas Equity Fund
    
Reconciliation of Level 3 Assets    
Total plan assets invested in active corporate bond funds (as a percent) 27.70% 26.60%
Target allocations by asset class (as a percent) 30.60% 28.60%
Total invested in equities (as a percent) 50.00%  
Active Corporate Bond Funds
    
Fair value of pension assets    
Fair value measurements 58.5 52.1
Reconciliation of Level 3 Assets    
Fair value of plan assets - beginning of year 52.1  
Fair value of plan assets - end of year 58.5 52.1
Total plan assets invested in active corporate bond funds (as a percent) 39.20% 40.60%
Target allocations by asset class (as a percent) 34.50% 38.20%
Diversified Investment Funds
    
Fair value of pension assets    
Fair value measurements 2.9 3.1
Reconciliation of Level 3 Assets    
Fair value of plan assets - beginning of year 3.1  
Fair value of plan assets - end of year 2.9 3.1
Total plan assets invested in active corporate bond funds (as a percent) 1.90% 2.40%
Target allocations by asset class (as a percent) 1.90% 2.20%
Insurance Contracts
    
Fair value of pension assets    
Fair value measurements 3.6 3.1
Reconciliation of Level 3 Assets    
Fair value of plan assets - beginning of year 3.1  
Fair value of plan assets - end of year 3.6 3.1
Total plan assets invested in active corporate bond funds (as a percent) 2.40% 2.40%
Target allocations by asset class (as a percent) 2.40% 2.40%
Cash and cash equivalents
    
Fair value of pension assets    
Fair value measurements 1.0  
Reconciliation of Level 3 Assets    
Fair value of plan assets - end of year 1.0  
Target allocations by asset class (as a percent) 0.70%  
Level 2
    
Fair value of pension assets    
Fair value measurements 142.8 122.4
Reconciliation of Level 3 Assets    
Fair value of plan assets - end of year 142.8 122.4
Level 2 | Equity funds
    
Fair value of pension assets    
Fair value measurements 83.3 70.0
Reconciliation of Level 3 Assets    
Fair value of plan assets - end of year 83.3 70.0
Level 2 | Active Corporate Bond Funds
    
Fair value of pension assets    
Fair value measurements 58.5 52.1
Reconciliation of Level 3 Assets    
Fair value of plan assets - end of year 58.5 52.1
Level 2 | Diversified Investment Funds
    
Fair value of pension assets    
Fair value measurements   0.3
Reconciliation of Level 3 Assets    
Fair value of plan assets - end of year   0.3
Level 2 | Cash and cash equivalents
    
Fair value of pension assets    
Fair value measurements 1.0  
Reconciliation of Level 3 Assets    
Fair value of plan assets - end of year 1.0  
Level 3
    
Fair value of pension assets    
Fair value measurements 6.5 5.9
Reconciliation of Level 3 Assets    
Fair value of plan assets - beginning of year 5.9 5.1
Actual return on plan assets 0.3 0.4
Purchases, sales and settlements   0.3
Changes due to exchange rates 0.3 0.1
Fair value of plan assets - end of year 6.5 5.9
Level 3 | Diversified Investment Funds
    
Fair value of pension assets    
Fair value measurements 2.9 2.8
Reconciliation of Level 3 Assets    
Fair value of plan assets - beginning of year 2.8 2.5
Actual return on plan assets 0.2 0.2
Purchases, sales and settlements (0.2) 0.1
Changes due to exchange rates 0.1  
Fair value of plan assets - end of year 2.9 2.8
Level 3 | Insurance Contracts
    
Fair value of pension assets    
Fair value measurements 3.6 3.1
Reconciliation of Level 3 Assets    
Fair value of plan assets - beginning of year 3.1 2.6
Actual return on plan assets 0.1 0.2
Purchases, sales and settlements 0.2 0.2
Changes due to exchange rates 0.2 0.1
Fair value of plan assets - end of year $ 3.6 $ 3.1