Shareholders' Equity and Stock-Based Compensation (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Accumulated Other Comprehensive income
Balance at beginning of period	$ 287.5
Other comprehensive income (loss), net	(224.9)	2.1	95.6
Balance at end of period	62.6	287.5
Pension and postretirement liability adjustment and other, tax (provision) benefit	(5.2)	1.0	0.8
Accum. Other Comprehensive Income
Components of Accumulated Other Comprehensive income
Balance at beginning of period	287.5	284.8
Other comprehensive income (loss) before reclassifications	(230.9)	0.2
Amounts reclassified from accumulated other comprehensive income	6.0	2.5
Other comprehensive income (loss), net	(224.9)	2.7	95.0
Balance at end of period	62.6	287.5	284.8
Foreign Currency Translation Adjustment
Components of Accumulated Other Comprehensive income
Balance at beginning of period	296.8	293.8
Other comprehensive income (loss) before reclassifications	(237.8)	3.0
Other comprehensive income (loss), net	(237.8)	3.0
Balance at end of period	59.0	296.8
Net Unrealized Losses on Qualifying Cash Flow Hedges
Components of Accumulated Other Comprehensive income
Balance at beginning of period	(0.8)	(3.3)
Other comprehensive income (loss) before reclassifications	(1.6)	(1.0)
Amounts reclassified from accumulated other comprehensive income	1.1	3.5
Other comprehensive income (loss), net	(0.5)	2.5
Balance at end of period	(1.3)	(0.8)	(3.3)
Net unrealized gain (loss) on qualifying cash flow hedges, tax benefit (provision)	1.1	1.0	2.5
Net Unrealized Losses on Available-for-Sale Securities
Components of Accumulated Other Comprehensive income
Balance at beginning of period	(3.7)	(3.1)
Other comprehensive income (loss) before reclassifications	3.6	(0.6)
Amounts reclassified from accumulated other comprehensive income	0.1
Other comprehensive income (loss), net	3.7	(0.6)
Balance at end of period		(3.7)
Pension and Postretirement Liability Adjustment and Other
Components of Accumulated Other Comprehensive income
Balance at beginning of period	(4.8)	(2.6)
Other comprehensive income (loss) before reclassifications	4.9	(1.2)
Amounts reclassified from accumulated other comprehensive income	4.8	(1.0)
Other comprehensive income (loss), net	9.7	(2.2)
Balance at end of period	4.9	(4.8)	(2.6)
Pension and postretirement liability adjustment and other, tax (provision) benefit	(3.0)	2.2	1.2
Pension and postretirement liability adjustment and other, tax benefit of unamortized prior service credits		0.2	1.2
Pension and Postretirement Liability Adjustment and Other | EGS Electrical Group, LLC and Subsidiaries ("EGS")
Components of Accumulated Other Comprehensive income
Pension and postretirement liability adjustment and other, tax (provision) benefit		$ (5.0)	$ (3.8)