Restructuring Costs (Restructuring Reserves by Cost Type) (Details) - USD ($) $ in Millions	12 Months Ended			51 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Restructuring Costs	$ 74.9	$ 77.2	$ 52.8
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0.8
Restructuring Costs	65.0
Restructuring Reserve Settled	(27.1)
Ending Balance	38.7	0.8		$ 0.8
Other Restructuring [Member] | Facility Exit Costs and Other [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0.0
Restructuring Costs	5.7
Restructuring Reserve Settled	(5.7)
Ending Balance	0.0	0.0		0.0
Other Restructuring [Member] | Employee Severance, Termination Benefits And Relocation Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0.8
Restructuring Costs	56.2
Restructuring Reserve Settled	(18.8)
Ending Balance	38.2	0.8		0.8
Other Restructuring [Member] | Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0.0
Restructuring Costs	3.1
Restructuring Reserve Settled	(2.6)
Ending Balance	0.5	0.0		0.0
Project Renewal [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	66.6	40.3
Restructuring Costs	9.9	74.0	53.8	319.7
Restructuring Reserve Settled	(43.3)	(47.7)
Ending Balance	33.2	66.6	40.3	66.6
Project Renewal [Member] | Facility Exit Costs and Other [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0.0	0.0
Restructuring Costs	2.6	6.7	7.5	30.0
Restructuring Reserve Settled	(2.6)	(6.7)
Ending Balance	0.0	0.0	0.0	0.0
Project Renewal [Member] | Employee Severance, Termination Benefits And Relocation Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	49.3	22.8
Restructuring Costs	(9.1)	52.4	25.2	209.4
Restructuring Reserve Settled	(24.4)	(25.9)
Ending Balance	15.8	49.3	22.8	49.3
Project Renewal [Member] | Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	17.3	17.5
Restructuring Costs	16.4	14.9	21.1	80.3
Restructuring Reserve Settled	(16.3)	(15.1)
Ending Balance	17.4	17.3	$ 17.5	17.3
Project Renewal [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 66.6
Ending Balance		$ 66.6		$ 66.6