Leases - ROU Assets and Lease Liabilities (Details) $ in Millions	Dec. 31, 2019 USD ($)
ROU assets:
Operating lease ROU assets	$ 429.6
Finance lease ROU assets	55.3
Total ROU assets	484.9
Lease liabilities:
Operating lease liabilities - current	85.5
Operating lease liabilities - noncurrent	344.1
Finance lease liabilities - current	6.4
Finance lease liabilities - noncurrent	42.2
Liabilities	$ 478.2