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Stock-Based Compensation Plans Schedule of Non-Vested Restricted Stock Units Activity (Tables)
 6 Months Ended
Jun. 30, 2017
Performance Based Restricted Stock [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Changes to non-vested performance-based restricted stock units for the six months ended June 30, 2017 were as follows:
Shares (in millions)
Number
of
Shares
Weighted
Average Fair
Value at Date
of Grant
Non-vested at December 31, 2016
0.3


$26.48

Granted
0.3

21.27

Vested
(0.3
)
26.23

Forfeited
—

—

Non-vested at June 30, 2017
0.3


$21.28
Time-Based Restricted Stock [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Changes to non-vested time-based restricted stock units for the six months ended June 30, 2017 were as follows:

Shares (in millions)
Number
of
Shares
Weighted
Average Fair
Value at Date
of Grant
Non-vested at December 31, 2016
1.3


$23.23

Granted
0.2

23.06

Vested
(0.5
)
22.72

Forfeited
—

—

Non-vested at June 30, 2017
1.0


$23.38