Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Other current liabilities
Unrealized losses on foreign exchange contracts	$ 12.1	$ 5.8
Product warranty obligations	33.6	34.1	36.6	36.9
Taxes other than income taxes	35.1rok_TaxesOtherThanIncomeTaxesCurrent	37.2rok_TaxesOtherThanIncomeTaxesCurrent
Accrued interest	15.0us-gaap_InterestPayableCurrent	15.6us-gaap_InterestPayableCurrent
Income taxes payable	85.6us-gaap_AccruedIncomeTaxesCurrent	41.0us-gaap_AccruedIncomeTaxesCurrent
Other	57.9us-gaap_OtherAccruedLiabilitiesCurrent	54.6us-gaap_OtherAccruedLiabilitiesCurrent
Other current liabilities	$ 239.3us-gaap_OtherLiabilitiesCurrent	$ 188.3us-gaap_OtherLiabilitiesCurrent

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details

- Definition

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

+ References+ Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details