Impact of Recently Issued Accounting Guidance (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019
Impact of Recently Issued Accounting Standards-Not Yet Adopted
Operating lease right-of-use assets	$ 188.0
Operating lease liability	$ 189.3
Restated Amount | ASU 2016-02 Leases
Impact of Recently Issued Accounting Standards-Not Yet Adopted
Operating lease right-of-use assets		$ 186.3
Operating lease liability		$ 187.1