Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Amount of debt hedged by interest rate derivatives.

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Credit facility, maximum borrowing capacity under term loan and revolver combined

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The total amount of the contingent obligations allowed to issue under letters of credit as of the reporting date

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Term Loan, Quarterly Principal Payment Percentage

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section S45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336

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Fixed interest rate related to the interest rate derivative.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Credit Agreements 2016 Credit Agreement (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended
	Mar. 11, 2016	May 31, 2013	Sep. 30, 2016	Mar. 31, 2015	Jun. 30, 2016	Oct. 01, 2015	Oct. 15, 2014	Sep. 30, 2011
Line of Credit Facility [Line Items]
Derivative, Fixed Interest Rate		0.73%				1.104%
Derivative, Notional Amount			$ 486.6		$ 468.7
2014 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity							$ 500.0
2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	5 years
Credit facility, maximum borrowing capacity							750.0
Long-term Debt					25.0
Debt Issuance Costs, Line of Credit Arrangements, Net					2.9
Debt Instrument, Unused Borrowing Capacity, Amount					325.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.25%
Revolving Credit Facility [Member] \| 2014 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity							300.0
Letters of Credit, maximum issuance amount							10.0
Revolving Credit Facility [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit	$ 0.0
Line of Credit Facility, Current Borrowing Capacity	0.0
Letters of Credit, maximum issuance amount	10.0
Term Loan [Member] \| 2014 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Long-term Debt							200.0
Term Loan [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Long-term Debt	0.0				395.0
Swingline Loan [Member] \| 2014 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity							$ 100.0
Swingline Loan [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 0.0
LIBOR Plus Margin [Member] \| 2014 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			50.00%	1.75%
LIBOR Plus Margin [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.00%
One Month LIBOR Plus Margin [Member] \| 2014 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.75%
One Month LIBOR Plus Margin [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			100.00%
One Month LIBOR Plus Rate [Member] \| 2014 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.00%
One Month LIBOR Plus Rate [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.00%
Debt Instrument, Redemption, Period One [Member] \| Term Loan [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Term Loan, Quarterly Principal Payment Percentage	0.63%
Debt Instrument, Redemption, Period Two [Member] \| Term Loan [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Term Loan, Quarterly Principal Payment Percentage	1.25%
Debt Instrument, Redemption, Period Three [Member] \| Term Loan [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Term Loan, Quarterly Principal Payment Percentage	1.88%
Debt Instrument, Redemption, Period Four [Member] \| Term Loan [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Term Loan, Quarterly Principal Payment Percentage	2.50%
Debt Instrument, Redemption, Period Five [Member] \| Term Loan [Member] \| 2016 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Term Loan, Quarterly Principal Payment Percentage	72.50%
Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Amount Of Debt Hedged By Interest Rate Derivatives		$ 100.0	$ 100.0
Derivative, Fixed Interest Rate								1.30%
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Line of Credit Facility [Line Items]
Derivative, Notional Amount					$ 100.0