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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block]



( in millions)	December 31, 2017												December 31, 2016
	Gross Carrying Amount				Accumulated Amortization				Net Amount				Gross Carrying Amount				Accumulated Amortization				Net Amount
Sales order book	$	54.6			$	25.9			$	28.7			$	54.6			$	19.9			$	34.7
Customer relationships	68.9				14.9				54.0				68.9				10.3				58.6
Total	$	123.5			$	40.8			$	82.7			$	123.5			$	30.2			$	93.3

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The amount of amortization expense for intangible assets in each of the succeeding years is estimated to be as follows (in millions):



2018	$	8.1
2019	7.1
2020	10.3
2021	8.9
2022	9.0
Thereafter	39.3
Total	$	82.7