Revenue Recognition (Net Contract Assets (Liabilities)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 0.2	$ 1.3	$ 2.8	$ 4.2
Contract with Customer, Asset, after Allowance for Credit Loss	0.0		0.0		$ 2.5
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress			$ (2.5)
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress, Percent			(100.00%)
Contract with Customer, Liability, Current	(8.4)		$ (8.4)		(13.0)
Contract with Customer, Liability, Current, Net, Change in Timeframe, Performance Obligation Satisfied Revenue Recognized			$ 4.6
Contract with Customer, Liability, Current, Net, Change in Timeframe, Performance Obligation Satisfied Revenue Recognized, Percent			(35.40%)
Contract with Customer, Liability, Noncurrent	(5.9)		$ (5.9)		(5.9)
Contract with Customer, Liability, Noncurrent, Net, Change in Timeframe, Performance Obligation Satisfied Revenue Recognized			$ 0.0
Contract with Customer, Liability, Noncurrent, Net, Change in Timeframe, Performance Obligation Satisfied Revenue Recognized, Percent			0.00%
Contract with Customer, Asset (Liability), Net	$ (14.3)		$ (14.3)		$ (16.4)
Contract with Customer, Asset (Liability), Change in Timeframe, Performance Obligation Satisfied Revenue Recognized			$ 2.1