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
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 410.9 $ 315.1 $ 230.4
Charged to Costs and Expenses (158.4) (1.1) (231.5)
Charged to Other Accounts (12.3) 8.1 23.8
Deductions 202.6 88.8 292.4
Balance at End of Period 442.8 410.9 315.1
Trade accounts receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 9.1 7.8 7.5
Charged to Costs and Expenses 5.6 5.0 2.2
Charged to Other Accounts 0.0 0.0 0.0
Deductions (3.8) (3.7) (1.9)
Balance at End of Period 10.9 9.1 7.8
Deferred income tax asset valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 401.8 307.3 222.9
Charged to Costs and Expenses (164.0) (6.1) (233.7)
Charged to Other Accounts (12.3) 8.1 23.8
Deductions 206.4 92.5 294.3
Balance at End of Period $ 431.9 $ 401.8 $ 307.3