Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 0.5	$ 0.0
Cap agreement effective 1/1/17-12/31/18 [Member]
Derivative [Line Items]
Interest Rate Cap, cap rate	1.50%
Derivative, Notional Amount	$ 1,400.0
Interest Rate Cap, fair value	5.0
Derivative [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	1.0	$ 1.0
Interest Rate Contract [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	0.4
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent	0.3
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 1.0