Intangible Assets and Goodwill (Tables)

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

(In millions)	Capacity Agreement			Developed Technology			Total
March 31, 2017
Cost	$	10.1		$	4.3		$	14.4
Accumulated amortization	(0.3		)	(1.1		)	(1.4		)
Intangible assets, net	$	9.8		$	3.2		$	13.0
December 31, 2016
Cost	$	—		$	4.3		$	4.3
Accumulated amortization	—			(0.9		)	(0.9		)
Intangible assets, net	$	—		$	3.4		$	3.4

Schedule of Amortization Expense for Intangible Assets

Amortization expense for intangible assets consisted of the following:

	Three Months Ended
	March 31,
(In millions)	2017		2016
Amortization expense	$	0.5	$	0.2

Schedule of Intangible Assets Estimated Amortization Expense

Estimated amortization expense for the remainder of 2017 and each of the next four years is as follows:

(In millions)	2017 (Remainder)		2018		2019		2020		2021
Amortization expense	$	2.1	$	2.7	$	2.7	$	2.7	$	2.6