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Guarantees (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Parent company guarantees on lease obligations	$ 630.8	$ 739.1
Parent company guarantees relating to credit facilities	399.6	293.8
Cash pooling guarantees	109.2	$ 207.7
Assets pledged as security for parent company guarantees	$ 0.0