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Retirement Plans Amounts in Accumulated Other Comprehensive Income (Loss) and Other Comprehensive (Income) Loss (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 4 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2013
Pension Plan, Defined Benefit [Member]
Sep. 30, 2012
Pension Plan, Defined Benefit [Member]
Sep. 30, 2011
Pension Plan, Defined Benefit [Member]
Sep. 30, 2011
Other Postretirement Benefit Plan, Defined Benefit [Member]
Sep. 30, 2013
Other Postretirement Benefit Plan, Defined Benefit [Member]
Sep. 30, 2012
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]                  
Net actuarial (gain) loss       $ 551.2 $ 877.0     $ (17.9) $ (0.1)
Prior service cost (credit)       7.8 5.0     (10.9) (1.8)
Total accumulated other comprehensive loss (income)       559.0 882.0     (28.8) (1.9)
Net actuarial (gain) loss arising during period (303.9) 375.0 336.0 (286.6) 377.6 334.0 2.0 (17.3) (2.5)
Amortization of net actuarial loss (39.3) (21.4) (18.9) (39.3) (21.4) (18.9) 0 0 0
Prior service (cost) credit arising during period (5.2) 2.2 (0.3) 4.1 2.6 0.7 (1.0) (9.3) (0.5)
Amortization of prior service (cost) credit (1.5) (0.7) (0.7) (1.2) (0.8) (0.7) 0 (0.3) 0.1
Net amount recognized in other comprehensive (income) loss       $ (323.0) $ 358.0 $ 315.1 $ 1.0 $ (26.9) $ (2.9)