Stock-Based Compensation (Details 1) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 23.3	[1]	$ 29.3	[1]	$ 15.2	[1]
Payout ratio for shares paid	100.00%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 11.5		$ 17.1		$ 5.7
Weighted-average fair value of grants, per share	$ 88.26		$ 78.00		$ 48.64
Payout ratio for shares paid	153.20%		86.90%		52.50%

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