Leases - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use asset	$ 189.1
Location of operating lease right-of-use asset in statement of financial position	us-gaap:OtherAssets
Operating lease liabilities	$ 204.2
Location of operating lease liability in statement of financial location	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
Operating lease costs	$ 52.5