Supplemental Disclosures - Schedule of Cash Flow, Supplemental Disclosures and Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Non-cash financing activities:
Liability incurred for purchase of business	$ 12.7	$ 0.0	$ 0.0
Debt assumed through purchase of equity interest and assets	0.0	50.6	0.0
Non-cash activities:
Capital expenditures in accounts payable and other liabilities	155.3	233.9	165.6
Right-of-use assets obtained in exchange of lease liabilities	17.5
Cash (received) paid for:
Interest income	(10.2)	(6.1)	(3.0)
Interest expense	97.2	80.0	92.1
Income taxes, net of refunds	62.9	53.2	67.8
Operating lease payments in operating cash flows	37.6
Adoption of ASU 2016-18
Cash and cash equivalents	894.2	1,069.6	949.2
Restricted cash (included in other current assets)	0.0	17.5	17.4
Cash, cash equivalents and restricted cash in Consolidated Statements of Cash Flows	$ 894.2	$ 1,087.1	$ 966.6	$ 1,045.8