Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

uture estimated minimum lease payments and expected lease administration payments follow (in millions):

2018	$	3.7
2019	1.7
2020	0.9
2021	0.9
2022	0.9
Thereafter	4.8
	$	12.9