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Employee Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
Before-Tax Amount  
Accumulated other comprehensive loss as of December 31, 2014 $ (341.5)
Amortization of net actuarial loss 8.5
Amortization of prior service cost 0.4
Accumulated other comprehensive loss as of September 30, 2015 (332.6)
Income Tax  
Accumulated other comprehensive loss as of December 31, 2014 (88.2)
Amortization of net actuarial loss 2.1
Amortization of prior service cost 0.1
Accumulated other comprehensive loss as of September 30, 2015 (86.0)
After-Tax Amount  
Accumulated other comprehensive loss as of December 31, 2014 (253.3)
Amortization of net actuarial loss 6.4
Amortization of prior service cost 0.3
Accumulated other comprehensive loss as of September 30, 2015 $ (246.6)