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Cost of Contracts, net (Tables)
 12 Months Ended
Dec. 31, 2017
Other Deferred Costs, Net [Abstract]  
Schedule of cost of contracts, net
The table below shows the Company's amortization expense related to costs of contracts for the years ended December 31, 2017, 2016 and 2015, and is included in Depreciation and amortization within the Consolidated Statements of Income.
 
Year Ended December 31,
(millions)
2017
 
2016
 
2015
Amortization expense
$
3.2

 
$
3.4

 
$
3.1

Weighted average life (years)
9.8

 
9.6

 
9.0

Cost of contracts, net, is comprised of the following:
 
December 31,
(millions)
2017
 
2016
Cost of contracts
$
30.5

 
$
30.4

Accumulated amortization
(21.6
)
 
(19.0
)
Cost of contracts, net
$
8.9

 
$
11.4
Schedule of expected future amortization of cost of contracts
The expected future amortization of cost of contracts is as follows:
(millions)
Cost of
Contract
2018
$
2.8

2019
2.2

2020
1.1

2021
0.6

2022
0.5

2023 and Thereafter
1.7

Total
$
8.9