Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2012	Jun. 30, 2012 Interest Rate Swap Agreements	Dec. 31, 2010 Interest Rate Swap Agreements	Dec. 31, 2012 Interest Rate Swap Agreements U.S. dollars	Dec. 31, 2012 Foreign Currency Forward Exchange Contracts	Dec. 31, 2011 Foreign Currency Forward Exchange Contracts	Dec. 31, 2010 Foreign Currency Forward Exchange Contracts	Dec. 31, 2012 Cash flow hedges Foreign Currency Forward Exchange Contracts	Dec. 31, 2011 Cash flow hedges Foreign Currency Forward Exchange Contracts	Dec. 31, 2010 Cash flow hedges Foreign Currency Forward Exchange Contracts	Dec. 31, 2012 Designated as Hedging Instrument Interest Rate Swap Agreements	Jun. 30, 2012 Designated as Hedging Instrument Interest Rate Swap Agreements	Dec. 31, 2011 Designated as Hedging Instrument Interest Rate Swap Agreements	Dec. 31, 2010 Designated as Hedging Instrument Interest Rate Swap Agreements	Dec. 31, 2012 Designated as Hedging Instrument Foreign Currency Forward Exchange Contracts	Dec. 31, 2011 Designated as Hedging Instrument Foreign Currency Forward Exchange Contracts	Dec. 31, 2012 Not Designated as Hedging Instrument Foreign Currency Forward Exchange Contracts	Dec. 31, 2011 Not Designated as Hedging Instrument Foreign Currency Forward Exchange Contracts
Derivative Financial Instruments
Floating rate obligation												$ 75		$ 98
Fixed interest rate (as a percent)	0.8625%	0.6725%	1.03%
Variable rate basis	LIBOR			LIBOR
Notional amount											160.0				201.2	168.9
Gains (losses) recognized in income								(3.1)	3.1	(5.7)
Net gains (losses) on derivative contracts not designated as hedges					5.3	4.8
Gains (losses) in other comprehensive income, effective portion								6.4	2.9	3.9
Carrying value / fair value of derivative assets not designated as hedging instruments included in other assets															3.6	0.6	3.1	0.1
Carrying value / fair value of derivative liabilities not designated as hedging instruments included in other liabilities											1.0		0.6		1.6	6.1	0.1	3.8
Accumulated other comprehensive income, change in fair value of foreign currency forward exchange contracts under hedge designations
Unrealized losses at beginning of period	(4.8)				(4.5)	(0.2)	(1.4)
Gains (losses) reclassified to net sales					2.4	(2.2)	3.9
Increase (decrease) in fair value, net of tax					4.5	(2.1)	(2.7)
Unrealized gains (losses) at end of period, net of tax	2.2				(2.4)	(4.5)	(0.2)
Foreign currency gains reclassified into earnings over next twelve months	$ 0.7