Basis of Presentation and Summary of Significant Accounting Policies Cash flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Capital Expenditures Incurred but Not yet Paid	$ 171.9	$ 214.9	$ 221.0
Cash paid for interest	271.9	285.0	308.7
Cash paid for taxes, net of refunds	$ 127.0	$ 57.0	$ (32.3)