Revenue (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Decrease in inventory	$ (299.7)		$ (282.8)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Increase in unbilled contract revenue		$ 13.6
Decrease in accrued income taxes		0.9
Decrease in inventory		10.1
Increase in retained earnings		$ 2.6
Transferred over Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract liabilities	22.9		23.0
Contract assets	$ 52.5		$ 40.1
Revenue from Contract with Customer | Transferred over Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percentage of consolidated sales	16.00%
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Payment term	30 days
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Payment term	90 days