Income Tax Unrecognized Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 51.6	$ 41.9	$ 39.7
Additions for tax positions related to the current year	18.1	22.3	13.5
Additions for tax positions of prior years	0.0	0.7	13.6
Reductions for tax positions of prior years	0.0	(8.4)	0.0
Settlements	0.0	0.0	(12.8)
Release due to statute expirations	(0.8)	(1.6)	(14.6)
Foreign currency adjustment	3.5	(3.3)	2.5
Balance at end of year	$ 72.4	$ 51.6	$ 41.9