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Favorable and Unfavorable Acquired Lease Contracts, net (Tables)
 12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Schedule of favorable and unfavorable lease contracts
The following presents a summary of favorable and unfavorable lease contracts:
 
Favorable
 
Unfavorable
 
December 31,
 
December 31,
(millions)
2016
 
2015
 
2016
 
2015
Acquired fair value of lease contracts
$
73.0

 
$
74.0

 
$
(82.6
)
 
$
(88.2
)
Accumulated (amortization) accretion
(43.0
)
 
(35.9
)
 
42.4

 
37.9

Total acquired fair value of lease contracts, net
$
30.0

 
$
38.1

 
$
(40.2
)
 
$
(50.3
)
Schedule of expected future amortization (accretion) of lease contract rights
The expected future amortization (accretion) of acquired lease contracts is as follows:
(millions)
Favorable
 
Unfavorable
 
Unfavorable,
Net
2017
$
6.4

 
$
(9.0
)
 
$
(2.6
)
2018
4.0

 
(7.3
)
 
(3.3
)
2019
3.6

 
(4.8
)
 
(1.2
)
2020
3.1

 
(3.7
)
 
(0.6
)
2021
2.4

 
(2.7
)
 
(0.3
)
2022 and Thereafter
10.5

 
(12.7
)
 
(2.2
)
Total
$
30.0

 
$
(40.2
)
 
$
(10.2
)