Derivative Financial Instruments (Summary of Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain(Loss) Recognized in AOCI (Effective Portion)			$ 5.3	$ (2.1)
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (0.4)	$ 0.4	(1.6)	0.7
Continuing Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(0.4)	0.4	(1.5)	0.7
Discontinued Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)			(0.1)
Natural Gas Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain(Loss) Recognized in AOCI (Effective Portion)			0.2	(1.0)
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)		0.2	(0.4)	0.3
Foreign Exchange Contracts - Purchases [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain(Loss) Recognized in AOCI (Effective Portion)			0.1	(0.4)
Foreign Exchange Contracts - Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain(Loss) Recognized in AOCI (Effective Portion)			0.7	(0.8)
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)	$ 0.2	(0.3)	0.4
Interest Rate Swap Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain(Loss) Recognized in AOCI (Effective Portion)			4.3	$ 0.1
Interest Rate Swap Contracts [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (0.3)		$ (0.8)