Restructuring and Other Reorganization-Related Costs 2013 Plan (Details) (2013 Restructuring Plan [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Beginning liability balance	$ 50.9
Restructuring reversals	(0.4)
Cash payments	(30.0)
Ending liability balance	20.5
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning liability balance	46.5
Restructuring reversals	(0.4)
Cash payments	(29.1)
Ending liability balance	17.0
Real Estate [Member]
Restructuring Cost and Reserve [Line Items]
Beginning liability balance	3.9
Restructuring reversals	0
Cash payments	(0.5)
Ending liability balance	3.4
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Beginning liability balance	0.5
Restructuring reversals	0
Cash payments	(0.4)
Ending liability balance	0.1
IAN
Restructuring Cost and Reserve [Line Items]
Restructuring reversals	(0.2)
CMG
Restructuring Cost and Reserve [Line Items]
Restructuring reversals	$ (0.2)