Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Payments of interest and commitment fees	$ 125.1	$ 56.8
Interest Paid, Capitalized	19.9	11.9
Incurred liabilities for fixed and intangible asset additions	$ 55.3	$ 50.2