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Pension and Other Postretirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Pension Plans, Defined Benefit [Member]
       
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 0.5 $ 0.5 $ 1.0 $ 1.0
Interest cost 7.9 8.4 15.8 16.8
Expected return on plan assets (8.0) (8.3) (16.0) (16.5)
Amortization of prior service cost 0.1 0.1 0.4 0.1
Net periodic benefit cost 0.5 0.7 1.2 1.4
Other Postretirement Benefit Plans, Defined Benefit [Member]
       
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0.1 0.1
Interest cost 0.4 0.5 0.8 0.9
Amortization of prior service cost (0.5) (0.5) (1.0) (1.0)
Net periodic benefit cost $ (0.1) $ 0 $ (0.1) $ 0