Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Millions		6 Months Ended
	Jan. 01, 2019	Jun. 30, 2019	Jun. 30, 2018
Cash paid during the period for:
Interest (net of amount capitalized)		$ 83.8	$ 83.0
Accounts payable and property, plant and equipment		36.1	$ 58.9
Non-cash adjustments:
Right-of-use assets obtained in exchange for lease obligations	$ 18.0	$ 18.0