Financing Arrangements - Long-term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Long-term debt
Total Long-term debt	$ 595.7	$ 522.7
Current portion of long-term debt	15.1	0.6
Long-term debt	580.6	522.1
Series A Medium Term Note [Member]
Long-term debt
Total Long-term debt	$ 175.0	$ 175.0
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	6.74%	6.74%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	7.76%	7.76%
Debt Instruments Maturity Date	May 01, 2028	May 01, 2028
Senior Unsecured Notes - 3.875% [Member]
Long-term debt
Total Long-term debt	$ 345.4	$ 346.4
Debt Instrument, Interest Rate, Stated Percentage	3.875%	3.875%
Debt Instruments Maturity Date	Sep. 01, 2024	Sep. 01, 2024
Senior Unsecured Notes - Variable Rate [Member]
Long-term debt
Total Long-term debt	$ 75.2	$ 0.0
Other Long Term Debt [Member]
Long-term debt
Total Long-term debt	$ 0.1	$ 1.3

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

+ 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(a)(1))
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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 210
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-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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