Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Details)

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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation Allowance of Deferred Tax Assets [Member]        
Valuation and Qualifying Accounts Disclosure [Line Items]        
Valuation Allowances and Reserves, Balance $ 2,238.5 $ 3,334.8 $ 3,372.5 $ 1,152.3
Valuation Allowances and Reserves, Charged to Cost and Expense (1,104.3) (40.6) 54.3  
Valuation Allowances and Reserves, Charged to Other Accounts (9.8) 5.1 2,165.9  
Valuation Allowances and Reserves, Reserves of Businesses Acquired 17.8 0.0 0.0  
Valuation Allowances and Reserves, Deductions 0.0 2.2 0.0  
Allowance for Trade Receivables [Member]        
Valuation and Qualifying Accounts Disclosure [Line Items]        
Valuation Allowances and Reserves, Balance 0.0 0.0 7.1 $ 0.0
Valuation Allowances and Reserves, Charged to Cost and Expense 0.0 0.0 7.1  
Valuation Allowances and Reserves, Charged to Other Accounts 0.0 (7.1) 0.0  
Valuation Allowances and Reserves, Reserves of Businesses Acquired 0.0 0.0 0.0  
Valuation Allowances and Reserves, Deductions $ 0.0 $ 0.0 $ 0.0