New Accounting Pronouncements (Details) - USD ($)	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases, Other Information [Line Items]
Additional Operating Lease Right-of-Use Assets	$ 253,400,000		$ 0
Additional Operating Lease Liabilities	$ 272,700,000
Accounting Standards Update 2016-02 [Member]
Leases, Other Information [Line Items]
Additional Operating Lease Right-of-Use Assets		$ 291,100,000
Additional Operating Lease Liabilities		$ 291,100,000