Litigation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		0 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Jul. 01, 2008 Trial by Jury, State of Rhode Island [Member] jury_trial defendant	Jun. 30, 2013 Foreign Tax Authority [Member]
Loss Contingencies [Line Items]
Number of jury trials			2
Number of additional defendants			2
Employee Stock Ownership Plan (ESOP), settlement payment	$ 80.0
Employee Stock Ownership Plan (ESOP), effect on net income due to settlement		49.2
Import tax examination, liability adjustment from settlement with taxing authority				11.8
Import tax examination, liability adjustment from settlement with taxing authority, after tax				$ 8.4