Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								3 Months Ended
	Mar. 31, 2014	Jun. 30, 2014	Jun. 30, 2014 Cash flow hedging Derivatives	Jun. 30, 2014 $150 senior unsecured notes	Sep. 30, 2013 $150 senior unsecured notes	Jun. 30, 2014 Carrying Value	Jun. 30, 2014 Level 1	Jun. 30, 2014 Level 2	Mar. 31, 2014 Level 3	Jun. 30, 2014 Level 3
Assets:
Cash and cash equivalents						$ 61.7	$ 61.7
Investments in rabbi trust						5.8	5.8
Derivative instruments						0.5		0.5
Liabilities:
$150 senior unsecured notes						148.9	162.2
Revolving credit facility						264.4		264.4
Term loan						182.5		182.5
Other borrowings		0.8				0.8		0.8
Derivative instruments						0.4		0.4
Warrants to purchase common stock						1.0
Fair value of warrants to purchase common stock										5.0
Long-term debt, principal				150	150
Aggregate notional value of derivatives			89.9
Exercised amount of warrants to purchase the common stock of Forethought	6.2								6.2
Gain on investments	$ 5.2								$ 5.2