Fair Value (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended			12 Months Ended
	Nov. 30, 2010	May 31, 2008	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Deferred Compensation Plans [Abstract]
Payments to Acquire Trading Securities Held-for-investment			$ 1.3		$ 1.4
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Forward exchange contract Gain (Loss) Reclassified to Cost of Sales, Net			0.1		0.1
Derivatives, Fair Value [Line Items]
Forward exchange contracts designated as cash flow hedges gain (loss) recognized in Accumulated Other Comprehensive Loss, Effective Portion, Net			0.5		(0.2)
Number of Forward Exchange contracts held			18
Maximum Remaining Maturity of forward exchange contracts			12 months
Notional Amount of Forward Exchange Contracts			1.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3			0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3			0		0
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]
Money Market Funds, at Carrying Value			404.2	[1]		423.6	[1]
Available-for-sale Investments			44.8			39.7
Trading Securities			6.7			5.8
Deferred Compensation Plan Liabilities			(6.7)			(5.8)
Derivatives: [Abstract]
Forward Exchange contracts			0.5			(0.2)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net, Total [Abstract]
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness			0
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness			0
Interest Rate Derivative [Line Items]
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	(1.6)	1.2	0.4			0.4
Long-term Debt [Abstract]
Long-term Debt, Fair Value			679.1			682.7
Long-Term Debt carrying value			596.8			596.7
Fair Value, Inputs, Level 1 [Member]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]
Money Market Funds, at Carrying Value			404.2	[1]		423.6	[1]
Available-for-sale Investments			44.8			39.7
Trading Securities			6.7			5.8
Deferred Compensation Plan Liabilities			(6.7)			(5.8)
Derivatives: [Abstract]
Forward Exchange contracts			0			0
Fair Value, Inputs, Level 2 [Member]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]
Money Market Funds, at Carrying Value			0			0
Available-for-sale Investments			0			0
Trading Securities			0			0
Deferred Compensation Plan Liabilities			0			0
Derivatives: [Abstract]
Forward Exchange contracts			0.5			(0.2)
Other accrued liabilities
Derivatives, Fair Value [Line Items]
Forward exchange contracts designated as cash flow hedges liabilities			(0.1)			(0.2)
Deferred taxes and other
Derivatives, Fair Value [Line Items]
Forward exchange contracts designated as cash flow hedges assets			$ 0.6			$ 0

[1] (a) Money market funds are reflected in Cash and cash equivalents in the Condensed Consolidated Balance Sheet.