Business Segment Information Business Segment Information (Restructuring Costs) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Restructuring Charges	$ 42.0	$ 66.0
Payments for Restructuring	100.0	100.0
Restructuring Reserve	57.0	57.0	$ 115.0	$ 91.0
Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	42.0	66.0
Payments for Restructuring	100.0	100.0
Restructuring Reserve	36.0	36.0	94.0	70.0
Economic Development Costs [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	0.0	0.0
Payments for Restructuring	0.0	0.0
Restructuring Reserve	$ 21.0	$ 21.0	$ 21.0	$ 21.0