Fair Value of Impaired Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 225.0	$ 0.0	$ 225.0	$ 0.0
Property, Plant and Equipment, Net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Long Lived Assets, Fair Value		0.0		0.0
Impairment of Long-Lived Assets to be Disposed of				25.7
Other Assets and Deferred Charges [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Long Lived Assets, Fair Value		$ 0.0		0.0
Impairment of Long-Lived Assets to be Disposed of				$ 0.9