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Employee Benefit Plans (Components of Net Pension Expense) (Details) (Pension Plans [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plans [Member]
     
Components of Net Pension Expense:      
Service cost $ 18.0 $ 16.0 $ 13.5
Interest cost 7.9 7.9 7.4
Expected return on plan assets (13.3) (11.0) (9.0)
Recognized net actuarial loss 3.1 2.5 1.5
Net Pension Expense $ 15.7 $ 15.4 $ 13.4
Assumptions Used to Determine End-of-Year Benefit Obligation:      
Discount rate 5.10% 4.10% 5.00%
Rate of compensation increase 5.00% 5.00% 5.00%
Cash balance interest crediting rate 4.00% 4.00% 4.00%
Assumptions Used to Determine Net Pension Expense:      
Discount rate 4.10% 5.00% 5.70%
Rate of compensation increase 5.00% 5.00% 5.00%
Expected return on plan assets 7.50% 7.75% 7.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate 4.00% 4.00% 4.00%