Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	$ 689.8	$ 625.0
Operating expenses:
Cost of revenues (exclusive of items shown separately below)	257.7	231.4
Selling, general and administrative	112.1	111.4
Depreciation and amortization of fixed assets	46.1	46.6
Amortization of intangible assets	41.0	33.2
Other operating income	(19.4)	0.0
Total operating expenses	437.5	422.6
Operating income	252.3	202.4
Other income (expense):
Investment loss and others, net	(2.1)	(0.4)
Interest expense	(33.5)	(31.9)
Total other expense, net	(35.6)	(32.3)
Income before income taxes	216.7	170.1
Provision for income taxes	(45.0)	(35.7)
Net income	$ 171.7	$ 134.4
Basic net income per share (USD per shares)	$ 1.05	$ 0.82
Diluted net income per share (USD per shares)	$ 1.04	$ 0.81
Weighted-average shares outstanding:
Basic (in shares)	162,894,306	163,528,343
Diluted (in shares)	165,724,120	166,544,945