Cost of Contracts, net (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of contract cost

The table below shows the Company's amortization expense related to costs of contracts for the years ended December 31, 2019, 2018 and 2017, and is primarily included in Depreciation and amortization within the Consolidated Statements of Income.

	Year Ended December 31,
(millions)	2019		2018		2017
Amortization expense	$	1.9	$	3.0	$	3.2
Weighted average life (years)	10.0		9.4		9.8

Effective January 1, 2019, cost of contracts associated with leases within the scope of ASU No. 2016-02 Leases (Topic 842) are included in the right-of-use assets balance. See Note 1. Significant Accounting Policies and Practices for the Cost of contract, net balance reclassified to right-of-use assets upon adoption of Topic 842. Additionally, see Note. 2 Leases for further discussion.

The expected future amortization of cost of contracts is as follows:

(millions)	Cost of Contract
2020	$	1.2
2021	0.8
2022	0.7
2023	0.6
2024	0.5
2025 and Thereafter	0.5
Total	$	4.3

Cost of contracts, net, is comprised of the following:

	December 31,
(millions)	2019			2018
Cost of contracts	$	26.0		$	33.8
Accumulated amortization	(21.7		)	(24.6		)
Cost of contracts, net	$	4.3		$	9.2