Fair Value Measurement - Financial Assets and Liabilities by Hierarchy Level (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale investments		$ 49.8	$ 51.2
Trading securities		17.2	14.3
Deferred compensation plan liabilities		(17.2)	(14.3)
Derivatives:
Forward exchange contracts-Assets	[1]	0.8	1.6
Forward exchange contracts-(Liabilities)	[2]	(0.1)	0.0
TOTAL		96.6	88.8
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale investments		0.0	0.0
Trading securities		17.2	14.3
Deferred compensation plan liabilities		(17.2)	(14.3)
Derivatives:
Forward exchange contracts-Assets	[1]	0.0	0.0
Forward exchange contracts-(Liabilities)	[2]	0.0	0.0
TOTAL		24.8	15.1
Quoted Prices in Active Markets for Similar Assets (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale investments		47.3	48.9
Trading securities		0.0	0.0
Deferred compensation plan liabilities		0.0	0.0
Derivatives:
Forward exchange contracts-Assets	[1]	0.8	1.6
Forward exchange contracts-(Liabilities)	[2]	(0.1)	0.0
TOTAL		69.3	71.4
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]
Available for sale investments		2.5	2.3
Trading securities		0.0	0.0
Deferred compensation plan liabilities		0.0	0.0
Derivatives:
Forward exchange contracts-Assets	[1]	0.0	0.0
Forward exchange contracts-(Liabilities)	[2]	0.0	0.0
TOTAL		2.5	2.3
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[3]	24.8	15.1
Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[3]	24.8	15.1
Money market funds | Quoted Prices in Active Markets for Similar Assets (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[3]	0.0	0.0
Money market funds | 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]
Cash and cash equivalents	[3]	0.0	0.0
Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[3]	21.3	20.9
Time Deposits | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[3]	0.0	0.0
Time Deposits | Quoted Prices in Active Markets for Similar Assets (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[3]	21.3	20.9
Time Deposits | 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]
Cash and cash equivalents	[3]	$ 0.0	$ 0.0

[1] Forward exchange contracts-Assets are reflected in Other current assets in the Condensed Consolidated Balance Sheet.

[2] Forward exchange contracts-(Liabilities) are reflected in Other accrued liabilities in the Condensed Consolidated Balance Sheet.

[3] Money market funds and time deposits are reflected in Cash and cash equivalents in the Condensed Consolidated Balance Sheet.