Fair Value Measurements - Other Hedges (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended		6 Months Ended																		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Foreign currency forward contracts	Jun. 30, 2012 Foreign currency forward contracts	Jun. 30, 2013 Foreign currency forward contracts	Jun. 30, 2012 Foreign currency forward contracts	Jun. 30, 2013 Other Current Assets	Dec. 31, 2012 Other Current Assets	Jun. 30, 2013 Other Current Liabilities	Dec. 31, 2012 Other Current Liabilities	Jun. 30, 2013 Hedges designated as hedging instruments Cash flow hedges	Dec. 31, 2012 Hedges designated as hedging instruments Cash flow hedges	Jun. 30, 2013 Hedges designated as hedging instruments Cash flow hedges Other Current Assets	Dec. 31, 2012 Hedges designated as hedging instruments Cash flow hedges Other Current Assets	Jun. 30, 2013 Hedges designated as hedging instruments Cash flow hedges Other Current Liabilities	Dec. 31, 2012 Hedges designated as hedging instruments Cash flow hedges Other Current Liabilities	Jun. 30, 2013 Other hedges not receiving hedge accounting	Dec. 31, 2012 Other hedges not receiving hedge accounting	Jun. 30, 2013 Other hedges not receiving hedge accounting Other Current Assets	Dec. 31, 2012 Other hedges not receiving hedge accounting Other Current Assets	Jun. 30, 2013 Other hedges not receiving hedge accounting Other Current Liabilities	Dec. 31, 2012 Other hedges not receiving hedge accounting Other Current Liabilities	Jun. 30, 2013 Other Expense	Jun. 30, 2012 Other Expense	Jun. 30, 2013 Other Expense	Jun. 30, 2012 Other Expense
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign Currency Transaction Gain, before Tax																							$ 0.1		$ 0.6
Foreign Currency Transaction Loss, before Tax																								0.7		1.7
Gain (loss) on foreign currency contracts			0.8	(0.5)	1.1	(0.1)
Notional Amount	170.9	295.1									119.8	248.6					51.1	46.5
Derivative assets fair value							6.9	5.5					6.9	5.5					0	0
Derivative liabilities fair value									$ (0.3)	$ (1.3)					$ (0.3)	$ (1.3)					$ 0	$ 0