Incentive Stock Plans Summary of Additional Information for Stock Options (Details) (Stock Options [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised	$ 12.3	[1]	$ 20.5	[1]	$ 10.4	[1]
Fair value of options vested	$ 2.6		$ 3.3		$ 2.5

[1] Intrinsic value of options exercised is the amount by which the fair value of the stock on the exercise date exceeded the exercise price of the option.