Income Taxes - Operating Loss Carryforwards (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 71.5
Expiration date	Dec. 31, 2024
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	519.4	39.9
Operating loss carryforwards subject to expiration	20.3
Operating loss carryforwards not subject to expiration	499.1
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 109.2	$ 145.8
Minimum [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2015
Minimum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2015
Maximum [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2034
Maximum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2034