Income Taxes - Operating Loss Carryforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 1,198.0
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards subject to expiration	187.0
Operating loss carryforwards not subject to expiration	1,011.0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 84.2	$ 104.8
Minimum [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2017
Minimum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2017
Maximum [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2036
Maximum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2036