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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 15.5 $ 24.6 $ 40.1 $ 46.1
Other comprehensive income:        
Changes in cumulative translation adjustment 1.0 (4.0) 1.2 (3.5)
Changes in unrealized gains/(losses) on derivative instruments, net of tax of $0.0, $0.0, $0.1 and $0.0, respectively 0 (0.2) (0.1) 0
Amortization of prior service credit, net of tax of $0.1, $0.1, $0.2 and $0.2, respectively (0.2) (0.3) (0.4) (0.5)
Amortization of actuarial net losses, net of tax of $(0.1), $0.0, $(0.2) and $0.0, respectively 0.2 0 0.4 0.1
Total other comprehensive income 1.0 (4.5) 1.1 (3.9)
Total comprehensive income $ 16.5 $ 20.1 $ 41.2 $ 42.2