Shareholders' Equity and Stock-Based Compensation (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Loss
Foreign currency translation adjustment	$ 298.1	$ 199.7
Net unrealized losses on qualifying cash flow hedges, net of tax	(3.3)	(4.4)
Net unrealized losses on qualifying cash flow hedges, tax	2.5	2.9
Net unrealized losses on available-for-sale securities	(3.1)	(1.5)
Pension and postretirement liability adjustment and other, net of tax	(520.6)	(440.3)
Pension and postretirement liability adjustment and other, tax benefit	318.5	274.3
Accumulated other comprehensive loss	(228.9)	(246.5)
EGS Electrical Group, LLC and subsidiaries ("EGS")
Accumulated other comprehensive loss
Pension liability adjustment related to joint venture	$ 3.8	$ 3.8