Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended											3 Months Ended
	Mar. 31, 2013 item	Jun. 30, 2012 Interest Rate Swap Agreements	Dec. 31, 2010 Interest Rate Swap Agreements	Mar. 31, 2013 Interest Rate Swap Agreements U.S. dollars	Mar. 31, 2013 Foreign Currency Forward Exchange Contracts	Mar. 31, 2012 Foreign Currency Forward Exchange Contracts	Mar. 31, 2013 Cash flow hedges Foreign Currency Forward Exchange Contracts	Mar. 31, 2012 Cash flow hedges Foreign Currency Forward Exchange Contracts	Mar. 31, 2013 Designated as Hedging Instrument Interest Rate Swap Agreements	Dec. 31, 2012 Designated as Hedging Instrument Interest Rate Swap Agreements	Jun. 30, 2012 Designated as Hedging Instrument Interest Rate Swap Agreements	Dec. 31, 2010 Designated as Hedging Instrument Interest Rate Swap Agreements	Mar. 31, 2013 Designated as Hedging Instrument Foreign Currency Forward Exchange Contracts	Dec. 31, 2012 Designated as Hedging Instrument Foreign Currency Forward Exchange Contracts	Mar. 31, 2013 Not Designated as Hedging Instrument Foreign Currency Forward Exchange Contracts	Mar. 31, 2012 Not Designated as Hedging Instrument Foreign Currency Forward Exchange Contracts	Dec. 31, 2012 Not Designated as Hedging Instrument Foreign Currency Forward Exchange Contracts
Derivative Financial Instruments
Floating rate obligation											$ 75	$ 98
Fixed interest rate (as a percent)		0.6725%	1.03%
Variable rate basis				LIBOR
Carrying value / fair value of derivative assets included in other assets													0.9	3.6	0.1		3.1
Carrying value / fair value of derivative liabilities included in other liabilities									0.8	1.0			5.5	1.6	4.4		0.1
Notional amount													212.0	201.2
Gains (losses) in other comprehensive income, effective portion							7.7	(4.7)
Increase (reduction) of gross margin recognized							0.2	(0.5)
Number of credit contingency features	0
Net gains (losses) on derivative contracts not designated as hedges															(4.7)	3.2
Accumulated other comprehensive income, change in fair value of foreign currency forward exchange contracts under hedge designations
Unrealized gains (losses) at beginning of period, net of tax					2.4	(4.5)
(Gains) losses reclassified to net sales					(0.2)	0.4
(Decrease) increase in fair value					(6.0)	3.4
Unrealized losses at end of period, net of tax					(3.8)	(0.7)
Foreign currency gains reclassified into earnings over next twelve months	$ 3.0