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Retirement Benefits - Schedule of Allocation of Plan Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets $ 3,754.8 $ 3,788.3  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 84.6 77.2 $ 85.4
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 2,827.3 2,890.1  
Defined benefit plan, fair value of plan assets excluding those measured using the NAV practical expedient 2,729.7 2,779.2  
U.S. Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1,431.7 1,389.9  
U.S. Plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1,297.1 1,388.4  
U.S. Plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.9 0.9  
U.S. Plans | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 2.0 1.1  
U.S. Plans | Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 2.0 1.1  
U.S. Plans | Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 222.1 230.1  
U.S. Plans | Mutual funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 222.1 230.1  
U.S. Plans | Mutual funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Mutual funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 964.7 911.7  
U.S. Plans | Common stock | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 964.7 911.7  
U.S. Plans | Common stock | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common stock | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 422.2 411.2  
U.S. Plans | Common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0    
U.S. Plans | Common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 422.2 411.2  
U.S. Plans | Common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Corporate debt      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 627.7 663.7  
U.S. Plans | Corporate debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Corporate debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 627.7 663.7  
U.S. Plans | Corporate debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 348.7 356.4  
U.S. Plans | Common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 242.9 247.0  
U.S. Plans | Common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 105.8 109.4  
U.S. Plans | Common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 141.4 204.1  
U.S. Plans | Common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 141.4 204.1  
U.S. Plans | Common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.9 0.9  
U.S. Plans | Insurance contracts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Insurance contracts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Insurance contracts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.9 0.9 0.9
U.S. Plans | Private equity | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 36.5 49.9  
U.S. Plans | Alternative equity | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 61.1 61.0  
Non-US Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding those measured using the NAV practical expedient 917.7 888.7  
Non-US Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 73.1 61.8  
Non-US Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 760.9 750.6  
Non-US Plan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 83.7 76.3  
Non-US Plan | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 927.5 898.2  
Non-US Plan | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 12.8 3.3  
Non-US Plan | Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 12.8 3.3  
Non-US Plan | Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 59.2 57.3  
Non-US Plan | Common stock | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 59.2 57.3  
Non-US Plan | Common stock | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Common stock | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 320.7 311.1  
Non-US Plan | Common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 320.7 311.1  
Non-US Plan | Common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Corporate debt      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 33.8 37.0  
Non-US Plan | Corporate debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Corporate debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 33.8 37.0  
Non-US Plan | Corporate debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 16.6 16.0  
Non-US Plan | Government securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1.1 1.2  
Non-US Plan | Government securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 15.5 14.8  
Non-US Plan | Government securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 310.4 301.1  
Non-US Plan | Common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 310.4 301.1  
Non-US Plan | Common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Real estate funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 80.5 86.6  
Non-US Plan | Real estate funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Real estate funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 80.5 86.6  
Non-US Plan | Real estate funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 9.8 9.5  
Non-US Plan | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 79.1 71.5  
Non-US Plan | Insurance contracts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Insurance contracts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Insurance contracts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 79.1 71.5 79.7
Non-US Plan | Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 4.6 4.8  
Non-US Plan | Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-US Plan | Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets $ 4.6 $ 4.8 $ 4.8