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Consolidated Statements of Operations - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues $ 2,784.6 $ 2,607.1 $ 2,395.1
Operating expenses:      
Cost of revenues (exclusive of items shown separately below) 993.9 976.8 886.2
Selling, general and administrative 413.9 603.5 378.7
Depreciation and amortization of fixed assets 192.2 185.7 165.3
Amortization of intangible assets 165.9 138.0 130.8
Other operating (income) loss (19.4) 6.2 0.0
Total operating expenses 1,746.5 1,910.2 1,561.0
Operating income 1,038.1 696.9 834.1
Other income (expense):      
Investment (loss) income and others, net (2.4) (1.7) 15.3
Interest expense (138.2) (126.8) (129.7)
Total other expense, net (140.6) (128.5) (114.4)
Total income before income taxes 897.5 568.4 719.7
Provision for income taxes (184.8) (118.5) (121.0)
Net income $ 712.7 $ 449.9 $ 598.7
Basic net income per share (in dollars per share) $ 4.38 $ 2.75 $ 3.63
Diluted net income per share (in dollars per share) $ 4.31 $ 2.70 $ 3.56
Weighted average shares outstanding:      
Basic (in shares) 162,610,586 163,535,438 164,808,110
Diluted (in shares) 165,320,709 166,560,115 168,297,836