Incentive Compensation Plans Schedule of Nonvested Stock Activity (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Stock Options Assumptions [Abstract]

Schedule of Nonvested Share Activity [Table Text Block]

A summary of the activity of our non-vested stock-settled awards, cash-settled awards and performance-based awards during 2017 is presented below (performance-based awards are shown at 100% of the shares originally granted).

	Stock-Settled Awards					Cash-Settled Awards				Performance-Based Awards
	Awards			Weighted- Average Grant-Date Fair Value (per award)		Awards		Weighted- Average Grant-Date Fair Value (per award)		Awards			Weighted- Average Grant-Date Fair Value (per award)
Non-vested as of January 1, 2017	2.3			$	20.84	0.1		$	20.49	8.5			$	19.16
Granted	0.8			24.18		0.0		23.33		4.8			20.06
Vested	(1.0		)	19.49		0.0		19.27		(4.6		)	16.64
Forfeited	0.0			21.86		0.0		20.50		(0.4		)	20.00
Non-vested as of December 31, 2017	2.1			$	22.78	0.1		$	22.52	8.3			$	21.05
Total unrecognized compensation expense remaining	$	24.1				$	1.0			$	71.9
Weighted-average years expected to be recognized over	1.0					1.0				1.7