Accounting Changes Pension and Post-Retirement Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Additions to Other Assets, Amount	$ 411.7	$ 335.9	$ 460.7
Operating Lease, Liability	429.4	$ 348.6	$ 483.6
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Tax Assets, Deferred Gain on Sale Leaseback Transaction	$ 4.0