Income Taxes Change in Valuation Allowances (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of Valuation Allowances
Beginning balance		$ 243.0	$ 255.6	$ 275.1
Reversed to costs and expenses		(28.0)	(4.6)	(15.4)
Charged (reversed) to gross tax assets and other accounts 1	[1]	5.1	(27.3)	9.5
Foreign currency translation		(9.1)	19.3	(13.6)
Ending balance		211.0	$ 243.0	$ 255.6
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Operating Loss Carryforwards		1,149.4
Undistributed Earnings of Foreign Subsidiaries		1,079.1
Foreign Tax Authority
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration		994.1
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		155.3
State and Local Jurisdiction
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		$ 26.8
Minimum | Foreign Tax Authority
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Operating Loss Carryforwards, Expiration Date		Jan. 01, 2019
Minimum | State and Local Jurisdiction
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Operating Loss Carryforwards, Expiration Date		Jan. 01, 2019
Maximum | Foreign Tax Authority
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Operating Loss Carryforwards, Expiration Date		Jan. 01, 2038
Maximum | State and Local Jurisdiction
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Operating Loss Carryforwards, Expiration Date		Jan. 01, 2038

[1] Primarily represents changes to the valuation allowance related to the change of a corresponding deferred tax asset.