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Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		3 Months Ended
	Dec. 31, 2012 employee	Mar. 31, 2013	Mar. 31, 2013 Employee Severance [Member] employee
Restructuring Cost and Reserve [Line Items]
Non-retirement postemployment benefit charges	$ 4.6
Non-retirement postemployment benefits, employees	178
Restructuring charges			2.5
Restructuring charges, employees affected			47
Payments made for restructuring charges			2.0
Restructuring reserve, remaining accrual		$ 5.0

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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