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Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other items, net $ (1.3) $ 1.6
Interest expense (13.4) (13.3)
Total before tax 119.0 134.1
Tax benefit (58.6) (38.5)
Net earnings 60.4 95.6
Amount Reclassified from AOCI    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net earnings (3.5) (1.4)
Gains and losses on cash flow hedges | Amount Reclassified from AOCI    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other items, net (2.4) 0.5
Interest expense (0.5) (0.7)
Total before tax (2.9) (0.2)
Tax benefit 0.6 0.2
Net earnings (2.3) 0.0
Amortization of defined benefit pension items | Amount Reclassified from AOCI    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Actuarial loss (1.5) (2.0)
Settlement loss (0.1) 0.0
Total before tax (1.6) (2.0)
Tax benefit 0.4 0.6
Net earnings $ (1.2) $ (1.4)