Certain Balance Sheet Information (Other Long-Term Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Contract liabilities	$ 144.7	$ 65.4
Contingent consideration	57.0	57.0
Operating leases	41.5	0.0
Asset retirement obligations	33.3	27.6
Other long-term liabilities	301.6	173.6
CMLP
Other long-term liabilities	295.6	171.0
Other
Other long-term liabilities	25.1	23.6
Other | CMLP
Other long-term liabilities	$ 19.1	$ 21.0