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Schedule II - Valuation and Qualifying Accounts (Valuation and Qualifying Accounts) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 6.2 $ 1.6 $ 1.0
Charged to Costs and Expenses (2.0) 3.7 0.5
Charged to Other Accounts (2.0) 0.9 0.1
Deductions/Write-offs 0.0 0.0 0.0
Balance at End of Period 2.2 6.2 1.6
Valuation Allowance of Deferred Tax Assets [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 735.7 977.5 1,301.3
Charged to Costs and Expenses (356.0) (242.5) (239.2)
Charged to Other Accounts 94.4 0.7 (84.6)
Deductions/Write-offs 0.0 0.0 0.0
Balance at End of Period 474.1 $ 735.7 977.5
Valuation Allowance of Deferred Tax Assets [Member] | Aptina [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Charged to Other Accounts     $ 15.8
Valuation Allowance of Deferred Tax Assets [Member] | Fairchild [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Charged to Other Accounts $ 81.6