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Basis of Presentation and Significant Accounting Policies - Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Basis of Presentation and Significant Accounting Policies
Cash receipts of retained beneficial interests in receivable sales	$ 369.8	$ 338.8	$ 154.5
Other Investments
Other investments	$ 73.7	$ 70.9
ASU 2016-02 | Subsequent Event | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use asset				$ 170.0
Lease payable obligation				$ 210.0

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Present value of lessee's discounted obligation for lease payments from operating lease.

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