Financial Instruments and Fair Value Measurement - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 126.9	$ 263.5
Available for sale investments	58.4	57.4
Trading securities	13.8	10.2
Deferred compensation plan liabilities	(13.8)	(10.2)
Derivatives:
Forward exchange contracts-Assets	0.2	0.8
Forward exchange contracts-(Liabilities)	(0.7)	(0.1)
Fair value, net asset (liability)	184.8	321.6
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	126.9	263.5
Available for sale investments	0.0	0.0
Trading securities	13.8	10.2
Deferred compensation plan liabilities	(13.8)	(10.2)
Derivatives:
Forward exchange contracts-Assets	0.0	0.0
Forward exchange contracts-(Liabilities)	0.0	0.0
Fair value, net asset (liability)	126.9	263.5
Quoted Prices in Active Markets for Similar Assets (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0.0	0.0
Available for sale investments	54.3	53.6
Trading securities	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Derivatives:
Forward exchange contracts-Assets	0.2	0.8
Forward exchange contracts-(Liabilities)	(0.7)	(0.1)
Fair value, net asset (liability)	53.8	54.3
Unobservable inputs for which little or no market data exists (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0.0	0.0
Available for sale investments	4.1	3.8
Trading securities	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Derivatives:
Forward exchange contracts-Assets	0.0	0.0
Forward exchange contracts-(Liabilities)	0.0	0.0
Fair value, net asset (liability)	$ 4.1	$ 3.8

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value of all liability derivatives designated as cash flow hedging instruments.

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Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income.

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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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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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Fair value of asset after deduction of liability.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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