Income Taxes - Operating Loss Carryforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 28.1
Expiration date	Dec. 31, 2024
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 625.8	$ 519.4
Operating loss carryforwards subject to expiration	22.6
Operating loss carryforwards not subject to expiration	603.2
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 104.8	$ 109.2
Minimum [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2016
Minimum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2016
Maximum [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2035
Maximum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2035