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Retirement Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Contributions to pension plans $ 4.8  
Contributions to retiree health care plan 0.5  
Total expected employer contributions in current fiscal year 20.0  
Defined Benefit Pension Plans [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 2.6 2.6
Interest cost 3.7 3.9
Expected return on assets (3.6) (3.8)
Other 0.4 0.1
Total benefit cost 3.1 2.8
Retiree Health Care Plan [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0.1
Interest cost 0.3 0.3
Expected return on assets 0 0
Other 0 0
Total benefit cost $ 0.3 $ 0.4