Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash paid during the period for:
Interest (net of amount capitalized)	$ 124.9	$ 125.8
Non-cash adjustments:
Accounts payable and property, plant and equipment	$ 51.9	$ 66.6