Supplemental Cash Flow Information - Supplemental Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, net of amount capitalized	$ 473.8	$ 492.9	$ 485.9
Cash paid (received) for income taxes, net	33.8	27.9	(24.9)
Noncash Investing and Financing Items [Abstract]
Accounts payable related to construction costs	127.8	153.1	159.9
Increase in receivable related to insurance proceeds	41.7	2.7	0.0
Non-cash capital contributions from noncontrolling interest	$ 1.5	$ 0.0	$ 21.0