Contractual interest rate for funds borrowed, under the debt agreement.

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Financing Agreements - Schedule of borrowings (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 15, 2014	Sep. 30, 2014
Financing Agreements
Total debt	$ 617.1us-gaap_LongTermDebt		$ 558.5us-gaap_LongTermDebt
Less: current portion	(9.0)us-gaap_LongTermDebtCurrent		(15.0)us-gaap_LongTermDebtCurrent
Long-term debt	608.1us-gaap_LongTermDebtNoncurrent		543.5us-gaap_LongTermDebtNoncurrent
$700 revolving credit facility, maturing December 19, 2019
Financing Agreements
Total debt	190.3		229.6
$200 term loan, final maturity December 19, 2019
Financing Agreements
Total debt	177.8		180.0
$150 senior unsecured notes, due July 15, 2020, net of discount
Financing Agreements
Total debt	149.0		148.9
Unsecured debt
Financing Agreements
Total debt	$ 100.0	$ 100.0	$ 0
Stated interest rate		4.60%