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Employee Benefit Obligations - Schedule of Plan Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 189.5 $ 204.5  
Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 59.6 45.7  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 129.9 158.8  
Common Stock [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 31.6 34.2  
Common Stock [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 18.6 19.9  
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 13.0 14.3  
Equity Securities, Foreign-listed [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 18.9 20.8  
Equity Securities, Foreign-listed [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 10.5 11.1  
Equity Securities, Foreign-listed [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Equity Securities, Foreign-listed [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 8.4 9.7  
Life insurance contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 35.5 37.7  
Life insurance contracts [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Life insurance contracts [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Life insurance contracts [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 35.5 37.7  
Other benefit plan assets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 33.9 39.7  
Other benefit plan assets [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Other benefit plan assets [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Other benefit plan assets [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 33.9 39.7  
U.S. Corporate and Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 25.0 24.6  
U.S. Corporate and Government Bonds [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 18.2 4.0  
U.S. Corporate and Government Bonds [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
U.S. Corporate and Government Bonds [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 6.8 20.6  
Benefit Plan Assets, Foreign Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 8.1 8.2  
Benefit Plan Assets, Foreign Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 8.1 6.4  
Benefit Plan Assets, Foreign Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Benefit Plan Assets, Foreign Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 1.8  
Foreign Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 11.2 8.6  
Foreign Government Bonds [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Foreign Government Bonds [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Foreign Government Bonds [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 11.2 8.6  
Real Estate Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 7.2 7.1  
Real Estate Investments [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1.2 1.2  
Real Estate Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Real Estate Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 6.0 5.9  
Foreign Corporate Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 18.1 23.6  
Foreign Corporate Bonds [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3.0 3.1  
Foreign Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Foreign Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 15.1 $ 20.5  
UNITED STATES      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan asset allocations 100.00% 100.00%  
Defined Benefit Plan, Fair Value of Plan Assets $ 72.6 $ 78.0 $ 73.8
UNITED STATES | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan asset allocations 62.00% 61.00%  
UNITED STATES | Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan asset allocations 35.00% 36.00%  
UNITED STATES | Other plan asset investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan asset allocations 3.00% 3.00%  
Non-US [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan asset allocations 100.00% 100.00%  
Defined Benefit Plan, Fair Value of Plan Assets $ 116.9 $ 126.5 $ 117.0
Non-US [Member] | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan asset allocations 6.00% 6.00%  
Non-US [Member] | Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan asset allocations 25.00% 22.00%  
Non-US [Member] | Other plan asset investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan asset allocations 69.00% 72.00%