Lessee Arrangements - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions		6 Months Ended
	Jan. 01, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		$ 6.2	$ 6.4
Operating lease right of use assets obtained in exchange for new lease obligations:		$ 11.8	$ 43.6	$ 2.8
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201602Member
ASU 2016-02 - Topic 842
Cash paid for amounts included in the measurement of lease liabilities:
Operating lease right of use assets obtained in exchange for new lease obligations:	$ 40.8