Derivative Financial Instruments (Summary of Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Accumulated Other Comprehensive Income (“AOCI”) (Effective Portion)	$ 0.9	$ (0.8)	$ 11.9
Derivatives in Cash Flow Hedging Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Accumulated Other Comprehensive Income (“AOCI”) (Effective Portion)	(0.5)	(1.4)	4.5
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(1.5)	(0.6)	(7.9)
Derivatives in Cash Flow Hedging Relationships [Member] | Continuing Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(1.5)	(0.5)	(8.1)
Derivatives in Cash Flow Hedging Relationships [Member] | Discontinued Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)		(0.1)	0.2
Derivatives in Cash Flow Hedging Relationships [Member] | Natural Gas Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Accumulated Other Comprehensive Income (“AOCI”) (Effective Portion)	0.7	(1.3)	0.6
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 (Effective Portion)	0.1	0.3	(1.2)
Derivatives in Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts - Purchases [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Accumulated Other Comprehensive Income (“AOCI”) (Effective Portion)	0.1	(0.5)
Derivatives in Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts - Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Accumulated Other Comprehensive Income (“AOCI”) (Effective Portion)	0.7	(1.8)	(2.9)
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 (Effective Portion)		0.1	1.4
Derivatives in Cash Flow Hedging Relationships [Member] | Interest Rate Swap Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Accumulated Other Comprehensive Income (“AOCI”) (Effective Portion)	(2.0)	2.2	6.8
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 (Effective Portion)	$ (1.6)	$ (0.9)	$ (8.3)