SEGMENT INFORMATION AND CONCENTRATION OF CREDIT RISK - Segment Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Deferred tax assets	$ 29.7	$ 29.3
Total Assets	1,990.9	1,888.1
Unallocated: [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Cash and cash equivalents, including current restricted cash	83.8	144.9
Deferred tax assets	29.7	29.3
Other assets, including long-term restricted investments and marketable securities	37.7	36.2
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	1,839.7	1,677.7
Operating Segments [Member] | RESV [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	610.7	647.0
Operating Segments [Member] | TECH [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	476.6	313.3
Operating Segments [Member] | DMS [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	378.4	393.4
Operating Segments [Member] | RHC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	175.0	134.5
Operating Segments [Member] | CES [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	$ 199.0	$ 189.5