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Favorable and Unfavorable Acquired Lease Contracts, net (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
 
2017
 
2018
 
2017
Acquired fair value of lease contracts
$
62.2

 
$
65.2

 
$
(70.6
)
 
$
(81.3
)
Accumulated (amortization) accretion
(44.6
)
 
(41.9
)
 
45.9

 
49.8

Total acquired fair value of lease contracts, net
$
17.6

 
$
23.3

 
$
(24.7
)
 
$
(31.5
)
Schedule of Favorable Acquired Lease Contracts
The table below shows the amortization expense for favorable acquired lease contracts, which is recognized as an increase to Cost of services - lease type contracts within the Consolidated Statements of Income for the years ended December 31, 2018, 2017 and 2016, along with the weighted average remaining useful life.
 
Year Ended December 31,
(millions)
2018
 
2017
 
2016
Amortization expense
$
5.7

 
$
6.6

 
$
8.3

Weighted average life (years)
12.0

 
14.1

 
11.9
Schedule of Unfavorable Acquired Lease Contracts
The table below shows the amortization expense for unfavorable acquired lease contracts, which is recognized as a decrease to Cost of services - lease type contracts within the Consolidated Statements of Income, for the years ended December 31, 2018, 2017 and 2016, along with the weighted average remaining useful life.
 
Year Ended December 31,
(millions)
2018
 
2017
 
2016
Amortization expense
$
6.7

 
$
8.8

 
$
10.1

Weighted average life (years)
7.9

 
10.7

 
10.5
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
2019
$
3.5

 
$
(5.6
)
 
$
(2.1
)
2020
3.0

 
(3.7
)
 
(0.7
)
2021
2.2

 
(2.7
)
 
(0.5
)
2022
1.5

 
(2.6
)
 
(1.1
)
2023
1.0

 
(2.2
)
 
(1.2
)
2024 and thereafter
6.4

 
(7.9
)
 
(1.5
)
Total
$
17.6

 
$
(24.7
)
 
$
(7.1
)