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Revenue (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Decrease in inventory $ (304.8)   $ (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 inventory   10.1  
Decrease in accrued income taxes   0.9  
Increase in retained earnings   $ 2.6  
Transferred over Time      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Contract liabilities 30.8   23.0
Contract assets $ 56.5   $ 40.1
Transferred over Time | Revenue from Contract with Customer      
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