Recently Adopted and Issued Accounting Standards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities		$ 82.0
Operating lease right-of-use assets		80.3
ASU 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax Cuts And Jobs Act Of 2017, tax effect, reclassification from Accumulated Other Comprehensive Loss to retained earnings, tax effect	$ 13.4
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities		82.0
Operating lease right-of-use assets		$ 80.3