Recent Accounting Pronouncements Adoption of 2016-13 - Expected Credit Loss - Adjustments for New Accounting Pronouncement [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Receivable [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of December 31, 2020 - Prior to Adoption of ASU 2016-13			$ 578.4
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (1.6)
Balance as of January 1, 2020 - Subsequent to Adoption of ASU 2016-13		$ 576.8
Other Current Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of December 31, 2020 - Prior to Adoption of ASU 2016-13			153.4
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(0.1)
Balance as of January 1, 2020 - Subsequent to Adoption of ASU 2016-13		153.3
Deferred Income Tax Asset
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of December 31, 2020 - Prior to Adoption of ASU 2016-13			138.1
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0.5
Balance as of January 1, 2020 - Subsequent to Adoption of ASU 2016-13		138.6
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of December 31, 2020 - Prior to Adoption of ASU 2016-13			$ 2,372.4
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (1.2)
Balance as of January 1, 2020 - Subsequent to Adoption of ASU 2016-13		$ 2,371.2