Condensed Consolidated Statement of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Sales
Products and solutions	$ 1,394.5us-gaap_SalesRevenueGoodsNet	$ 1,429.1us-gaap_SalesRevenueGoodsNet	$ 2,804.3us-gaap_SalesRevenueGoodsNet	$ 2,851.4us-gaap_SalesRevenueGoodsNet
Services	156.3us-gaap_SalesRevenueServicesNet	171.4us-gaap_SalesRevenueServicesNet	320.9us-gaap_SalesRevenueServicesNet	340.8us-gaap_SalesRevenueServicesNet
Total sales	1,550.8us-gaap_SalesRevenueNet	1,600.5us-gaap_SalesRevenueNet	3,125.2us-gaap_SalesRevenueNet	3,192.2us-gaap_SalesRevenueNet
Cost of sales
Products and solutions	(768.6)us-gaap_CostOfGoodsSold	(825.1)us-gaap_CostOfGoodsSold	(1,545.4)us-gaap_CostOfGoodsSold	(1,635.5)us-gaap_CostOfGoodsSold
Services	(109.0)us-gaap_CostOfServices	(119.6)us-gaap_CostOfServices	(219.1)us-gaap_CostOfServices	(237.2)us-gaap_CostOfServices
Total cost of sales	(877.6)us-gaap_CostOfGoodsAndServicesSold	(944.7)us-gaap_CostOfGoodsAndServicesSold	(1,764.5)us-gaap_CostOfGoodsAndServicesSold	(1,872.7)us-gaap_CostOfGoodsAndServicesSold
Gross profit	673.2us-gaap_GrossProfit	655.8us-gaap_GrossProfit	1,360.7us-gaap_GrossProfit	1,319.5us-gaap_GrossProfit
Selling, general and administrative expenses	(382.4)	(392.5)	(769.3)	(777.9)
Other income	1.4rok_OtherIncomeExpense	0.1rok_OtherIncomeExpense	3.2rok_OtherIncomeExpense	9.5rok_OtherIncomeExpense
Interest expense	(15.7)us-gaap_InterestExpense	(15.0)us-gaap_InterestExpense	(30.6)us-gaap_InterestExpense	(29.9)us-gaap_InterestExpense
Income before income taxes	276.5	248.4	564.0	521.2
Income tax provision	(70.5)us-gaap_IncomeTaxExpenseBenefit	(68.1)us-gaap_IncomeTaxExpenseBenefit	(143.8)us-gaap_IncomeTaxExpenseBenefit	(142.8)us-gaap_IncomeTaxExpenseBenefit
Net income	$ 206.0us-gaap_NetIncomeLoss	$ 180.3us-gaap_NetIncomeLoss	$ 420.2us-gaap_NetIncomeLoss	$ 378.4us-gaap_NetIncomeLoss
Earnings Per Share, Basic [Abstract]
Basic	$ 1.53us-gaap_EarningsPerShareBasic	$ 1.30us-gaap_EarningsPerShareBasic	$ 3.10us-gaap_EarningsPerShareBasic	$ 2.73us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted [Abstract]
Diluted	$ 1.51us-gaap_EarningsPerShareDiluted	$ 1.28us-gaap_EarningsPerShareDiluted	$ 3.08us-gaap_EarningsPerShareDiluted	$ 2.70us-gaap_EarningsPerShareDiluted
Cash dividends per share	$ 0.65	$ 0.58	$ 1.30	$ 1.16
Weighted average outstanding shares:
Basic	134.9	138.5	135.3	138.5
Diluted	136.0	140.2	136.5	140.2

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). Such amounts include: (a) Net (loss) gain on dispositions of securities and property, (b) interest income, (c) royalty income, (d) environmental charges, (e) gains or losses on deferred compensation plans, and (f) miscellaneous other income and expense items.

No definition available.