Employee Termination and Restructuring Plans - Reserve Rollforward (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Reserve [Roll Forward]
Beginning balance				$ 12.2									$ 12.2
Accrual additions	18.3	1.9	4.9	5.6	22.4	0	0	0.3	0.8	1.8	5.7	2.3	30.7	22.7	10.6
Cash payments													(21.6)
Non-cash expense													1.3
Ending balance	22.6				12.2								22.6	12.2
Employee Termination Costs
Restructuring Reserve [Roll Forward]
Beginning balance				9.3									9.3
Accrual additions	13.6				17.1								25.8
Cash payments													(17.7)
Non-cash expense													0.5
Ending balance	17.9				9.3								17.9	9.3
Property Costs
Restructuring Reserve [Roll Forward]
Beginning balance				2.8									2.8
Accrual additions													0.9
Cash payments													(1.2)
Non-cash expense													(0.8)
Ending balance	1.7												1.7
Other
Restructuring Reserve [Roll Forward]
Beginning balance				0.1									0.1
Accrual additions													4.0
Cash payments													(2.7)
Non-cash expense													1.6
Ending balance	$ 3.0												$ 3.0