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Derivative Financial Instruments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 EUR (€)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 898.4	$ 785.9
Unrealized translation (loss) gain on net investment hedge included in accumulated other comprehensive (loss) income, net of taxes	(39.9)	24.8
Euro-denominated notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized translation (loss) gain on net investment hedge included in accumulated other comprehensive (loss) income, net of taxes	(35.7)	29.0
Designated as economic hedges | Forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized translation (loss) gain on net investment hedge included in accumulated other comprehensive (loss) income, net of taxes	(4.2)	(4.2)
Not designated as hedges | Forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loss associated with forward contracts included in interest and other expenses		1.6
Gain associated with forward contracts included in interest and other expenses	0.0		$ 0.6
€400 due September 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	477.8	417.7
€400 due September 2022 | Designated as economic hedges | Euro-denominated notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount	477.8			€ 400,000,000
€350 due June 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	420.0	$ 367.5
€350 due June 2018 | Designated as economic hedges | Euro-denominated notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount	$ 420.0			€ 350,000,000.0

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (b)
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount, after tax, of cumulative translation adjustment attributable to gain (loss) on foreign currency derivatives that are designated as, and are effective as, economic hedges of a net investment in a foreign entity.

+ References

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