Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v2.4.0.8
Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2014
Senior Notes [Member]
Jul. 09, 2010
Senior Notes [Member]
Sep. 30, 2014
Carrying Reported Amount Fair Value Disclosure [Member]
Sep. 30, 2013
Carrying Reported Amount Fair Value Disclosure [Member]
Sep. 30, 2014
Fair Value Inputs Level1 [Member]
Sep. 30, 2013
Fair Value Inputs Level1 [Member]
Sep. 30, 2014
Fair Value Inputs Level2 [Member]
Sep. 30, 2013
Fair Value Inputs Level2 [Member]
Sep. 30, 2013
Fair Value Inputs Level3 [Member]
Assets:                      
Cash and cash equivalents         $ 58.0 $ 42.7 $ 58.0 $ 42.7      
Equity investments           1.0         5.0
Investments in rabbi trust         5.0 5.6 5.0 5.6      
Derivative instruments         1.2 1.5     1.2 1.5  
Liabilities:                      
$150 senior unsecured notes         148.9 148.8 163.7 155.3      
Revolving credit facility         229.6 325.5     229.6 325.5  
Term loan         180.0 190.0     180.0 190.0  
Derivative instruments         4.1 0.5     4.1 0.5  
Exercised amount of warrants to purchase the common stock of Forethought 6.2                    
Gain on investments 5.2 5.2                  
Additional disclosures                      
Carrying amount of private equity limited partnerships for which fair value is not readily available         12.1 10.3          
Long-term debt, principal     $ 150.0 $ 150.0              
Term of debt issued     10 years                
Debt Instrument, Interest Rate, Stated Percentage   5.50% 5.50% 5.50%