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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]        
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 1,287.3 $ 1,983.1 $ 3,095.1 $ 3,099.8
Valuation Allowances and Reserves, Charged to Cost and Expense (691.3) (1,120.0) (7.6)  
Valuation Allowances and Reserves, Charged to Other Accounts (4.5) (9.8) 5.1  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired 0.0 17.8 0.0  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction $ 0.0 $ 0.0 2.2  
SEC Schedule, 12-09, Allowance, Credit Loss [Member]        
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount     0.0 $ 7.1
Valuation Allowances and Reserves, Charged to Cost and Expense     0.0  
Valuation Allowances and Reserves, Charged to Other Accounts     (7.1)  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired     0.0  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction     $ 0.0