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Employee Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Before-Tax Amount  
Accumulated other comprehensive loss, beginning of period $ (279.4)
Amortization of net actuarial loss 6.6
Amortization of prior service cost 0.8
Accumulated other comprehensive loss, end of period (272.0)
Income Tax  
Accumulated other comprehensive loss, beginning of period (73.0)
Amortization of net actuarial loss 1.5
Amortization of prior service cost 0.3
Accumulated other comprehensive loss, end of period (71.2)
After-Tax Amount  
Accumulated other comprehensive loss, beginning of period (206.4)
Amortization of net actuarial loss 5.1
Amortization of prior service costs 0.5
Accumulated other comprehensive loss, end of period $ (200.8)