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Cost of Contracts, net
 12 Months Ended
Dec. 31, 2015
Other Deferred Costs, Net [Abstract]  
Cost of Contracts, net
Cost of Contracts, net
Cost of contracts, net is comprised of the following:
 
December 31,
(millions)
2015
 
2014
Cost of contracts
$
31.3

 
$
28.3

Accumulated amortization
(19.4
)
 
(17.8
)
Cost of contracts, net
$
11.9

 
$
10.5


The expected future amortization of cost of contracts is as follows:
(millions)
Cost of
Contract
2016
$
3.2

2017
3.0

2018
2.5

2019
1.6

2020
0.6

2021 and Thereafter
1.0

Total
$
11.9

Amortization expense related to cost of contracts was $3.1 million, $3.2 million and $2.8 million for the years ended December 31, 2015, 2014 and 2013 respectively. The weighted average remaining life was 9.0 years, 9.5 years and 9.6 years as of December 31, 2015, 2014 and 2013, respectively.