Financing Arrangements (7.750% Senior Notes) (Details) (7.750% Senior Notes [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Mar. 30, 2012	Jan. 25, 2013	Dec. 31, 2012	Jun. 14, 2011	Jan. 26, 2011
7.750% Senior Notes [Member]
Debt Instrument [Line Items]
Face amount of notes issued	$ 375.0				$ 350.0
Cash proceeds from issuance of notes	372.2
Stated interest rate for notes		7.75%	7.75%	7.75%	7.75%
Offering price as percentage of principal amount	99.25%
Discount amount of notes issued	$ 2.8