Financial Instruments (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended											0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 FX embedded derivatives and FX forward contracts	Dec. 31, 2011 FX embedded derivatives and FX forward contracts	Dec. 31, 2010 FX embedded derivatives and FX forward contracts	Dec. 31, 2012 FX forward contracts	Dec. 31, 2011 FX forward contracts	Dec. 31, 2012 FX forward contracts Minimum	Dec. 31, 2012 FX forward contracts Maximum	Dec. 31, 2012 FX embedded derivatives	Dec. 31, 2011 FX embedded derivatives	Dec. 31, 2012 Commodity contracts lb	Dec. 31, 2011 Commodity contracts lb	Aug. 31, 2010 Interest Rate Swaps
Derivative disclosures
Aggregate notional amount						$ 107.3	$ 66.1			$ 96.3	$ 73.2
Derivative contracts maturities in 2013						102.0				77.4
Derivative contracts maturities in 2014						5.3				11.4
Derivative contracts maturities in 2015										7.5
Derivative contract maturity period								1 year	2 years
Unrealized gain (loss), net of tax, recorded in AOCI related to commodity and FX forward contracts	3.3	4.4				3.4	3.7					0.1	(0.7)
Net loss recorded related to derivatives			0.2	37.0	17.3
Unrealized gain (loss) reclassified into income over the next 12 months	1.9
Percentage of strength of U.S. Dollar against GBP from inception of agreement						4.00%
Cash payment resulting from settlement of contracts							34.6
Notional amount of commodity contracts (in pounds of copper)												3,300,000	2,900,000
Fair value of derivative contract												0.2	(0.8)
Interest rate swaps
Fixed rate of interest on derivatives (as a percent)														4.795%
Cash payment including accrued interest on terminated swaps														26.9
Accrued interest														2.6
Charge to earnings														$ 24.3