Accumulated Other Comprehensive Loss Changes in Accumulated Other Comprehensive Loss (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
BALANCE AT DECEMBER 31, 2014	$ (164.3)
Other comprehensive income (loss) before reclassifications	(38.6)
Amounts reclassified from accumulated other comprehensive loss	4.3
Current period other comprehensive income (loss)	(34.3)
BALANCE AT SEPTEMBER 30, 2015	(198.6)
Cash flow hedge (loss) gain
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
BALANCE AT DECEMBER 31, 2014	0.0
Other comprehensive income (loss) before reclassifications	1.6
Amounts reclassified from accumulated other comprehensive loss	(1.0)
Current period other comprehensive income (loss)	0.6
BALANCE AT SEPTEMBER 30, 2015	0.6
Unrealized gain (loss) on available-for- sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
BALANCE AT DECEMBER 31, 2014	0.3
Other comprehensive income (loss) before reclassifications	(0.1)
Amounts reclassified from accumulated other comprehensive loss	0.0
Current period other comprehensive income (loss)	(0.1)
BALANCE AT SEPTEMBER 30, 2015	0.2
Pension and post retirement benefit plan adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
BALANCE AT DECEMBER 31, 2014	(124.7)
Other comprehensive income (loss) before reclassifications	0.0
Amounts reclassified from accumulated other comprehensive loss	5.3
Current period other comprehensive income (loss)	5.3
BALANCE AT SEPTEMBER 30, 2015	(119.4)
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
BALANCE AT DECEMBER 31, 2014	(39.9)
Other comprehensive income (loss) before reclassifications	(40.1)
Amounts reclassified from accumulated other comprehensive loss	0.0
Current period other comprehensive income (loss)	(40.1)
BALANCE AT SEPTEMBER 30, 2015	$ (80.0)