SUPPLEMENTAL CASH FLOW INFORMATION - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash paid during period for:
Interest	$ 216.6	$ 248.9	$ 296.2
Income taxes, net of refunds	500.0	216.8	349.7
Disclosure of non-cash financing and investing activities
Noncash conversion of zero-coupon convertible debt	0.0	8.4	0.3
Fair Value of Assets Acquired	0.0	48.7	0.6
Capital Expenditures Incurred but Not yet Paid	(1.2)	(2.7)	(22.1)
Notes Receivable, Fair Value Disclosure	$ 0.0	$ 110.0	$ 0.0