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Income Taxes, Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ 24.3	$ 5.0
U.S. Federal [Abstract]
Current	38.2	39.8	$ 12.2
Noncurrent Federal Tax Expense	0.7	35.7	122.2
Deferred	(12.9)	(20.1)	(23.7)
Total U.S. Federal	26.0	55.4	110.7
State and Local [Abstract]
Current	15.1	12.5	5.4
Noncurrent State and Local Tax Expense (Benefit)	0.0	7.5	19.1
Deferred	(7.0)	(5.0)	(5.0)
Total State and Local	8.1	15.0	19.5
International [Abstract]
Current	156.9	145.3	141.2
Deferred	(31.3)	(1.4)	(15.1)
Total International	125.6	143.9	126.1
Total provision for income taxes	$ 159.7	$ 214.3	$ 256.3
U.S. federal income tax rate	21.00%	21.00%	35.00%
Increase or decrease in current tax expense from utilization of prior years' net operating loss carryovers	$ 0.3	$ 22.2	$ (3.0)

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