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Basis of Preparation - Balance Sheet Impact (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Assets      
Accounts receivable, net of allowances $ 207.3 $ 222.7 $ 222.7
Inventories, net 223.1 197.3 208.9
Unbilled contract revenue 37.7 43.5 37.0
Prepaid expenses 16.7 13.8 15.4
Other current assets 22.4   27.4
Liabilities      
Accounts payable 124.4 114.1 113.9
Customer advances and billings in excess of contract revenue 114.7 100.3 110.2
Other current liabilities 32.4 41.5 41.4
Long-term deferred tax liabilities 62.9 63.1 62.5
Equity      
Retained earnings 372.4 366.6 364.3
Balances without adoption of ASC 606      
Assets      
Inventories, net     208.9
Unbilled contract revenue     37.0
Prepaid expenses     15.4
Liabilities      
Accounts payable     113.9
Customer advances and billings in excess of contract revenue     110.2
Other current liabilities     41.4
Long-term deferred tax liabilities     62.5
Equity      
Retained earnings     $ 364.3
Balances without adoption of ASC 606 | ASU 2014-09      
Assets      
Accounts receivable, net of allowances 206.0    
Inventories, net 233.8    
Unbilled contract revenue 30.3    
Prepaid expenses 19.3    
Other current assets 22.3    
Liabilities      
Customer advances and billings in excess of contract revenue 125.1    
Other current liabilities 31.2    
Long-term deferred tax liabilities 61.9    
Equity      
Retained earnings 368.9    
Adjustments due to ASC 606 | ASU 2014-09      
Assets      
Accounts receivable, net of allowances 1.3    
Inventories, net (10.7) (11.6)  
Unbilled contract revenue 7.4 6.5  
Prepaid expenses (2.6) (1.6)  
Other current assets 0.1    
Liabilities      
Accounts payable   0.2  
Customer advances and billings in excess of contract revenue (10.4) (9.9)  
Other current liabilities 1.2 0.1  
Long-term deferred tax liabilities 1.0 0.6  
Equity      
Retained earnings $ 3.5 $ 2.3