Debt and Credit Agreements Schedule of Line of Credit Facility (Tables)

12 Months Ended

Dec. 31, 2016

Schedule of Line of Credit Facility [Abstract]

Schedule of Line of Credit Facilities [Table Text Block]

A summary of our credit facilities is presented below.

	December 31,
	2016								2015
	Total Facility		Amount Outstanding		Letters of Credit		Total Available		Total Facility		Amount Outstanding		Letters of Credit		Total Available
Committed credit agreement	$	1,000.0	$	0.0	$	4.9	$	995.1	$	1,000.0	$	0.0	$	3.7	$	996.3
Uncommitted credit agreements	$	856.6	$	85.7	$	2.3	$	768.6	$	744.5	$	132.9	$	1.1	$	610.5