Supplemental Cash Flow Information (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	$ 45.2	$ 45.8
Income Taxes Paid, Net	0.9	1.8
Capital Expenditures Incurred but Not yet Paid	$ 43.5	$ 66.6