Incentive Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Incentive Based Compensation Plans [Abstract]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

The weighted average grant date fair value of these awards was based on the following weighted average Black-Scholes assumptions:

	2019			2018			2017
Exercise price per share	$	16.79		$	14.52		$	15.80
Expected annual dividend yield	1.2		%	1.4		%	1.3		%
Expected life in years	5.82			6.45			6.4
Expected volatility	43		%	43		%	42		%
Risk-free interest rate	2.5		%	2.8		%	2.1		%
Weighted average grant date fair value of stock option awards granted	$	6.62		$	5.83		$	6.07

Schedule of Share-based Compensation, Stock Options, Activity

The following is a summary of stock option award activity in 2019.

	Number of Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (in millions)
Outstanding at beginning of year	6,180,007	$	24.39
Granted	648,526	$	16.79
Exercised	(84,804)	$	8.17
Canceled	(1,083,998)	$	25.45
Outstanding at end of year	5,659,731	$	23.55	5 years	$	3
Exercisable at end of year	4,323,312	$	25.96	4 years	$	3
Expected to vest	1,319,850	$	15.76	8 years	$	—

Schedule of Nonvested Restricted Stock Units Activity

The following is a summary of restricted stock and restricted stock unit award activity in 2019.

	Awards		Weighted Average Grant Date Fair Value
Unvested at beginning of year	8,504,946		$	14.04
Granted	4,113,190		$	16.65
Vested and Exercised	(3,813,221	)	$	12.64
Canceled	(1,630,529	)	$	15.78
Unvested at end of year	7,174,386		$	15.88

Schedule of Performance Units, Valuation [Table Text Block]

The key assumptions used in the Monte Carlo simulation to determine the fair value of stock-based performance units granted in 2019, 2018 and 2017 were:

	2019(a)			2018			2017(b)
Valuation date stock price	$	16.79		$	13.69		$	13.58
Expected annual dividend yield	1.2		%	1.5		%	N/A
Expected volatility	43		%	41		%	N/A
Risk-free interest rate	2.5		%	1.5		%	N/A
Fair value of stock-based performance units outstanding	$	20.66		$	17.29		$	14.18

^(a)  Represents key assumptions at grant date, as 2019 performance unit awards are settled in stock.

^(b) 

N/A as these stock-based performance unit awards vested as of December 31, 2019 and as such the value is based on the final payout.