Consolidated and Combined Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net earnings	$ 168.5	$ 254.2	$ 133.0
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	217.0	206.5	208.3
Amortization of debt issuance costs, bond premium and original issue discount	3.1	3.5	2.7
Loss on extinguishment of debt, net	5.8	12.6	0.0
Deferred income taxes, net	(7.5)	(78.4)	3.2
Equity-based compensation	50.9	18.9	12.4
Changes in assets and liabilities, net of acquired assets and liabilities:
Trade and other receivables, including receivables from related parties	44.5	(52.5)	(6.4)
Prepaid expenses and other assets	(41.5)	1.7	(11.2)
Deferred contract costs	(6.4)	35.6	26.2
Deferred revenues	(44.8)	(48.5)	(51.9)
Trade accounts payable and other liabilities	45.9	(2.5)	9.4
Net cash provided by operating activities	435.5	351.1	325.7
Cash flows from investing activities:
Additions to property and equipment	(30.0)	(27.4)	(38.1)
Additions to computer software	(73.1)	(53.3)	(41.9)
Business acquisitions, net of cash acquired	(43.4)	0.0	(150.2)
Other investing activities	2.4	(4.0)	0.0
Net cash used in investing activities	(144.1)	(84.7)	(230.2)
Cash flows from financing activities:
Borrowings	935.5	480.0	55.0
Debt repayments	(1,067.9)	(214.8)	(149.0)
Senior Notes redemption	0.0	(390.0)	0.0
Senior Notes redemption fee	0.0	(18.8)	0.0
Purchases of treasury stock	(141.5)	(136.7)	0.0
Distributions to members	0.0	(75.3)	(48.6)
Receipt from finalization of tax distribution	1.8	0.0	0.0
Capital lease payments	0.0	(13.8)	(5.0)
Tax withholding payments for restricted share vesting	(9.4)	(6.1)	0.0
Debt issuance costs	(5.8)	(8.6)	0.0
Net cash used in financing activities	(287.3)	(384.1)	(147.6)
Net increase (decrease) in cash and cash equivalents	4.1	(117.7)	(52.1)
Cash and cash equivalents, beginning of period	16.2	133.9	186.0
Cash and cash equivalents, end of period	20.3	16.2	133.9
Supplemental cash flow information:
Interest paid	(48.0)	(56.7)	(60.2)
Income taxes paid, net	$ (32.8)	$ (15.7)	$ (21.9)