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Quarterly Results (Unaudited) - Additonal Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule of Quarterly Financial Information [Line Items]    
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest $ 78.1 $ (42.0)
Net sales 646.5 602.3
Consolidated segment revenues 646.5 602.3
Operating income 26.6 41.3
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 500.8 302.8
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 28.8 (47.2)
Net income attributable to common and participating preferred stockholders 507.4 212.2
Net income attributable to controlling interest $ 507.4 $ 212.2
Income (Loss) from Continuing Operations, Per Basic Share $ 0.14 $ (0.24)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share $ 2.39 $ 1.30
Net income $ 578.9 $ 260.8
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share $ 2.37 $ 1.30
Earnings Per Share, Diluted $ 2.51 $ 1.06
Discontinued Operations, Held-for-sale [Member]    
Schedule of Quarterly Financial Information [Line Items]    
Operating income $ 0.0 $ 0.0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 459.9 250.4
Net income attributable to controlling interest 454.5 229.3
Net income $ 459.9 $ 250.4