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Cash Distributions and Net Income per Unit (Tables)
 6 Months Ended
Jun. 30, 2013
Partners' Capital Notes [Abstract]  
Schedule of Distributions Made to Members or Limited Partners, by Distribution [Table Text Block]

The following table provides a reconciliation of net income and the assumed allocation of net income to the common and class B units for purposes of computing net income per unit for the three months ended June 30, 2013, (in millions, except per unit data):
 
Total
 
Common
Units
 
Class B
 Units
 
General Partner and IDRs
Net income
$
70.4

 
 
 
 
 
 
Less: Net loss attributable to noncontrolling interests
(0.1
)
 
 
 
 
 
 
Net income attributable to controlling interests
70.5

 
 
 
 
 
 
Declared distribution
135.6

 
$
117.3

 
$
6.9

 
$
11.4

Assumed allocation of undistributed net loss
(65.1
)
 
(57.6
)
 
(6.2
)
 
(1.3
)
Assumed allocation of net income attributable to limited
    partner unitholders and general partner
$
70.5

 
$
59.7

 
$
0.7

 
$
10.1

Weighted-average units outstanding
 

 
212.3

 
22.9

 
 

Net income per unit
 

 
$
0.28

 
$
0.03

 
 

    
The following table provides a reconciliation of net income and the assumed allocation of net income to the common and class B units for purposes of computing net income per unit for the three months ended June 30, 2012, (in millions, except per unit data):
 
Total
 
Common
Units
 
Class B
 Units
 
General Partner and IDRs
Net income
$
65.1

 
 
 
 
 
 
Declared distribution
114.9

 
$
98.5

 
$
6.8

 
$
9.6

Assumed allocation of undistributed net loss
(49.8
)
 
(43.5
)
 
(5.3
)
 
(1.0
)
Assumed allocation of net income attributable to limited
     partner unitholders and general partner
$
65.1

 
$
55.0

 
$
1.5

 
$
8.6

Weighted-average units outstanding
 

 
184.9

 
22.9

 
 

Net income per unit
 

 
$
0.30

 
$
0.07

 
 


The following table provides a reconciliation of net income and the assumed allocation of net income to the common and class B units for purposes of computing net income per unit for the six months ended June 30, 2013, (in millions, except per unit data):
 
Total
 
Common
Units
 
Class B
 Units
 
General Partner and IDRs
Net income
$
171.8

 
 
 
 
 
 
Less: Net loss attributable to noncontrolling interests
(0.1
)
 
 
 
 
 
 
Net income attributable to controlling interests
171.9

 
 
 
 
 
 
Declared distribution
263.8

 
$
227.9

 
$
13.7

 
$
22.2

Assumed allocation of undistributed net loss
(91.9
)
 
(81.2
)
 
(8.9
)
 
(1.8
)
Assumed allocation of net income attributable to limited
    partner unitholders and general partner
$
171.9

 
$
146.7

 
$
4.8

 
$
20.4

Weighted-average units outstanding
 

 
210.0

 
22.9

 
 

Net income per unit
 

 
$
0.70

 
$
0.21

 
 

    
The following table provides a reconciliation of net income and the assumed allocation of net income to the common and class B units for purposes of computing net income per unit for the six months ended June 30, 2012, (in millions, except per unit data):
 
Total
 
Common
Units
 
Class B
 Units
 
General Partner and IDRs
Net income
$
157.7

 
 
 
 
 
 
Less: Net income attributable to predecessor equity
0.2

 
 
 
 
 
 
Net income attributable to controlling interests
157.5

 
 
 
 
 
 
Declared distribution
229.8

 
$
196.9

 
$
13.7

 
$
19.2

Assumed allocation of undistributed net loss
(72.3
)
 
(63.1
)
 
(7.8
)
 
(1.4
)
Assumed allocation of net income attributable to limited
     partner unitholders and general partner
$
157.5

 
$
133.8

 
$
5.9

 
$
17.8

Weighted-average units outstanding
 

 
183.8

 
22.9

 
 

Net income per unit
 

 
$
0.73

 
$
0.26