Schedule II - Valuation Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deducted from Receivables — Allowance for Doubtful Accounts
Valuation Reserves [Roll Forward]
Balance at the Beginning of the Year	$ 9.9	$ 10.9	$ 9.0
Additions (Deductions) Charged to Expense	4.7	1.0	3.2
Deductions	(3.9)	(2.0)	(1.3)
Balance at the End of the Year	10.7	9.9	10.9
Deducted from Deferred Income Taxes — Valuation Allowance
Valuation Reserves [Roll Forward]
Balance at the Beginning of the Year	40.9	10.2	33.6
Additions (Deductions) Charged to Expense	0.3	39.2	1.1
Deductions	0.0	(8.5)	(24.5)
Balance at the End of the Year	$ 41.2	$ 40.9	$ 10.2