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Stock-Based Compensation Plans Stock-Based Compensation Plans (Schedule of Non-Vested Restricted Stock Units Activity) (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016 were as follows:
Shares (in millions)
Number
of
Shares
Weighted
Average Fair
Value at Date
of Grant
Non-vested at December 31, 2015
0.3

21.84

Granted
0.3

26.49

Vested
(0.3
)
21.87

Forfeited
—

—

Non-vested at June 30, 2016
0.3

$
26.48
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, 2016 were as follows:

Shares (in millions)
Number
of
Shares
Weighted
Average Fair
Value at Date
of Grant
Non-vested at December 31, 2015
1.3

20.20

Granted
0.5

26.43

Vested
(0.5
)
19.23

Forfeited
—

—

Non-vested at June 30, 2016
1.3

$
23.14