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Retirement Benefits (Schedule of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
[1]
Jun. 30, 2017
[1]
Mar. 31, 2017
[1]
Dec. 31, 2016
[1]
Sep. 30, 2016
[1]
Jun. 30, 2016
[1]
Mar. 31, 2016
[1]
Dec. 31, 2015
[1]
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]                      
Settlements $ 0.9 $ 5.5 $ 4.1 $ 0.0 $ 2.1 $ 1.0 $ 2.0 $ 0.0 $ 10.5 [1] $ 5.1 [1] $ 19.3
Defined Benefit Pension Plan                      
Defined Benefit Plan Disclosure [Line Items]                      
Settlements                 10.5 5.1 19.3
Defined Benefit Pension Plan | U.S.                      
Defined Benefit Plan Disclosure [Line Items]                      
Service cost                 29.0 36.5 42.2
Interest cost                 107.5 110.7 124.7
Expected return on plan assets                 (207.7) (202.0) (202.0)
Net actuarial loss amortization                 88.7 85.3 78.9
Prior service cost amortization                 2.3 2.8 2.8
Settlements                 10.5 5.1 18.9
Curtailments                 4.3 0.0 5.3
Special termination benefits                 2.8 2.0 7.2
Other                 0.0 (0.3) 1.0
Net periodic benefit cost                 37.4 40.1 79.0
Defined Benefit Pension Plan | U.S. | Discontinued Operations                      
Defined Benefit Plan Disclosure [Line Items]                      
Net periodic benefit cost                 (0.7) (7.9) (12.9)
Defined Benefit Pension Plan | U.S. | Continuing Operations                      
Defined Benefit Plan Disclosure [Line Items]                      
Net periodic benefit cost                 36.7 32.2 66.1
Defined Benefit Pension Plan | International                      
Defined Benefit Plan Disclosure [Line Items]                      
Service cost                 25.9 24.3 31.3
Interest cost                 32.2 44.3 57.8
Expected return on plan assets                 (75.2) (78.3) (79.8)
Net actuarial loss amortization                 54.7 35.6 41.4
Prior service cost amortization                 (0.1) (0.2) 0.0
Settlements                 1.7 1.3 2.3
Curtailments                 (1.3) (1.1) 0.0
Special termination benefits                 0.4 0.0 1.5
Other                 1.1 2.1 2.1
Net periodic benefit cost                 39.4 28.0 56.6
Defined Benefit Pension Plan | International | Discontinued Operations                      
Defined Benefit Plan Disclosure [Line Items]                      
Net periodic benefit cost                 (4.1) (4.4) (7.7)
Defined Benefit Pension Plan | International | Continuing Operations                      
Defined Benefit Plan Disclosure [Line Items]                      
Net periodic benefit cost                 $ 35.3 $ 23.6 $ 48.9
[1] For additional information, see Note 16, Retirement Benefits.