Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Leases
ROU asset	$ 190.4		$ 199.7
Balance sheet location of ROU asset	us-gaap:OtherAssets		us-gaap:OtherAssets
Lease liability	$ 229.5		$ 242.3
Balance sheet location of lease liability	us-gaap:OtherLiabilities		us-gaap:OtherLiabilities
Operating lease costs	$ 13.2	$ 15.0
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Minimum
Leases
Lease terms	1 year
Maximum
Leases
Lease terms	11 years
Lease extension terms	10 years