Long Term Debt and Financing Arrangements (Details) - USD ($) $ in Millions	Sep. 30, 2017	Aug. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 986.7		$ 990.5
Senior Notes \| Notes 2018
Debt Instrument [Line Items]
Long-term debt	$ 0.0		$ 299.3
Interest rate, stated percentage (as a percentage)	5.95%		5.95%
Senior Notes \| Notes 2022
Debt Instrument [Line Items]
Long-term debt	$ 297.8		$ 297.5
Interest rate, stated percentage (as a percentage)	3.625%		3.625%
Senior Notes \| Notes 2026
Debt Instrument [Line Items]
Long-term debt	$ 394.2		$ 393.7
Interest rate, stated percentage (as a percentage)	3.35%		3.35%
Senior Notes \| Notes 2027
Debt Instrument [Line Items]
Long-term debt	$ 294.7		$ 0.0
Interest rate, stated percentage (as a percentage)	3.15%	3.15%

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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