Guarantees (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Parent company guarantees on lease obligations	$ 739.1	$ 824.5
Parent company guarantees relating to credit facilities	293.8	349.1
Cash pooling guarantees	207.7	$ 207.8
Assets pledged as security for parent company guarantees	$ 0.0