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Summary of Significant Accounting Policies (Additional Cash Flow) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Noncash or Part Noncash Acquisitions [Line Items]      
Accrual for purchases of property and equipment $ 3.6 $ 2.3  
Other noncash expense   (0.2)  
Total net adjustment 12.7 4.0 $ 11.9
Adjustments to other comprehensive income related to underfunding of pension and SERP plans and changes in fair value of derivative financial instruments, tax 7.7 2.5 7.2
Dividends declared but not yet paid $ 5.6 4.9 4.9
Aerospace      
Noncash or Part Noncash Acquisitions [Line Items]      
Earnout payments to former owners   $ 1.4 $ 5.4
Warrant      
Noncash or Part Noncash Acquisitions [Line Items]      
Options issued in debt conversion (in shares) 624,044    
Stock conversion amount $ 30.3    
Bond Hedge Transactions - 2017 Notes [Member]      
Noncash or Part Noncash Acquisitions [Line Items]      
Shares received in noncash transaction (in shares) 136369    
Value of shares received $ 7.5    
2017 Notes      
Noncash or Part Noncash Acquisitions [Line Items]      
Stock conversion amount $ 7.5    
Debt Conversion, Converted Instrument, Shares Issued 136,347