Derivative Financial Instruments (Summary of Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI	$ (18.8)	$ 0.9	$ (0.8)
Derivatives in Cash Flow Hedging Relationships [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI	(20.0)	(0.5)	(1.4)
Gain (Loss) Reclassified from AOCI into Income	(1.4)	(1.5)	(0.6)
Derivatives in Cash Flow Hedging Relationships [Member] | Continuing Operations [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income	(1.4)	(1.5)	(0.5)
Derivatives in Cash Flow Hedging Relationships [Member] | Discontinued Operations [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income			(0.1)
Derivatives in Cash Flow Hedging Relationships [Member] | Natural Gas Commodity Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI		0.7	(1.3)
Derivatives in Cash Flow Hedging Relationships [Member] | Natural Gas Commodity Contracts [Member] | Cost of goods sold [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income		0.1	0.3
Derivatives in Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts - Purchases [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI		0.1	(0.5)
Derivatives in Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts - Sales [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI		0.7	(1.8)
Derivatives in Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts - Sales [Member] | Net Sales [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income			0.1
Derivatives in Cash Flow Hedging Relationships [Member] | Interest Rate Swap Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI	(20.0)	(2.0)	2.2
Derivatives in Cash Flow Hedging Relationships [Member] | Interest Rate Swap Contracts [Member] | Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income	$ (1.4)	$ (1.6)	$ (0.9)