Restructuring and Other Expense - Schedule of Restructuring Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restructuring Reserve [Roll Forward]
Charges	$ 17.7			$ 1.3	$ 19.0	$ 5.1
Restructuring Plan
Restructuring Reserve [Roll Forward]
Accrued balance, beginning	0.9	$ 1.1	$ 1.3		1.3
Charges	17.7	0.5	0.8
Usage and payments	(4.9)	(0.7)	(1.0)
Accrued balance, ending	13.7	0.9	1.1		13.7
Restructuring Plan | Severance and Related
Restructuring Reserve [Roll Forward]
Accrued balance, beginning	0.6	0.6	0.8		0.8
Charges	17.5	0.4	0.5
Usage and payments	(4.7)	(0.4)	(0.7)
Accrued balance, ending	13.4	0.6	0.6		13.4
Restructuring Plan | Lease Termination Costs
Restructuring Reserve [Roll Forward]
Accrued balance, beginning	0.0	0.2	0.3		0.3
Charges	0.0	0.0	0.0
Usage and payments	0.0	(0.2)	(0.1)
Accrued balance, ending	0.0	0.0	0.2		0.0
Restructuring Plan | Other
Restructuring Reserve [Roll Forward]
Accrued balance, beginning	0.3	0.3	0.2		0.2
Charges	0.2	0.1	0.3
Usage and payments	(0.2)	(0.1)	(0.2)
Accrued balance, ending	$ 0.3	$ 0.3	$ 0.3		$ 0.3