Stock-Based Compensation (Details 1) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Schedule of of information on performance share units
Compensation expense	$ 15.2	[1]	$ 13.7	[1]	$ 15.4	[1]
Weighted-average fair value of grants, per share	$ 48.64
Payout ratio for shares paid	100.00%
Performance Share Units [Member]
Schedule of of information on performance share units
Compensation expense	$ 5.7		$ 1.7		$ 4.1
Weighted-average fair value of grants, per share	$ 48.64		$ 31.78		$ 44.85
Payout ratio for shares paid	52.50%		0.00%		127.70%

[1] Stock-Based Compensation expense is recorded in our Corporate and other business segment.