Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash paid during the period for:
Interest (net of amount capitalized)	$ 125.8	$ 122.3
Non-cash adjustments:
Accounts payable and property, plant and equipment	$ 66.6	$ 81.0