Stock Plans 5 (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014
Summary of stock option information
Shares, Options outstanding	3.7
Aggregate intrinsic value, Options outstanding	$ 18.0
Weighted average remaining contractual life, Options outstanding (in years)	6 years 9 months 18 days
Weighted average exercise price, Options outstanding (in dollars per share)	$ 26.13
Shares, Options exercisable	0.7
Aggregate intrinsic value, Options exercisable	3.7
Weighted average remaining contractual life, Options exercisable (in years)	4 years
Weighted average exercise price, Options exercisable (in dollars per share)	$ 26.07
$13.18 - $20.00 [Member]
Summary of stock option information
Range of exercise prices, Minimum (in dollars per share)	$ 13.18
Range of exercise prices, Maximum (in dollars per share)	$ 20.00
Shares, Options outstanding	0
Aggregate intrinsic value, Options outstanding	0.1
Weighted average remaining contractual life, Options outstanding (in years)	1 year 7 months 6 days
Weighted average exercise price, Options outstanding (in dollars per share)	$ 16.77
Shares, Options exercisable	0
Aggregate intrinsic value, Options exercisable	0.1
Weighted average remaining contractual life, Options exercisable (in years)	0 years 2 months 12 days
Weighted average exercise price, Options exercisable (in dollars per share)	$ 15.10
$20.01 - $25.00 [Member]
Summary of stock option information
Range of exercise prices, Minimum (in dollars per share)	$ 20.01
Range of exercise prices, Maximum (in dollars per share)	$ 25.00
Shares, Options outstanding	1.2
Aggregate intrinsic value, Options outstanding	9.3
Weighted average remaining contractual life, Options outstanding (in years)	6 years 6 months
Weighted average exercise price, Options outstanding (in dollars per share)	$ 23.38
Shares, Options exercisable	0.3
Aggregate intrinsic value, Options exercisable	2.6
Weighted average remaining contractual life, Options exercisable (in years)	7 years 2 months 12 days
Weighted average exercise price, Options exercisable (in dollars per share)	$ 23.15
$25.01 - $30.00 [Member]
Summary of stock option information
Range of exercise prices, Minimum (in dollars per share)	$ 25.01
Range of exercise prices, Maximum (in dollars per share)	$ 30.00
Shares, Options outstanding	2.0
Aggregate intrinsic value, Options outstanding	8.2
Weighted average remaining contractual life, Options outstanding (in years)	6 years 8 months 12 days
Weighted average exercise price, Options outstanding (in dollars per share)	$ 26.69
Shares, Options exercisable	0.3
Aggregate intrinsic value, Options exercisable	1.0
Weighted average remaining contractual life, Options exercisable (in years)	1 year 6 months
Weighted average exercise price, Options exercisable (in dollars per share)	$ 27.61
$30.01 - over [Member]
Summary of stock option information
Range of exercise prices (in dollars per share)	$30.01 - over
Shares, Options outstanding	0.5
Aggregate intrinsic value, Options outstanding	0.4
Weighted average remaining contractual life, Options outstanding (in years)	8 years 1 month 6 days
Weighted average exercise price, Options outstanding (in dollars per share)	$ 30.56
Shares, Options exercisable	0.1
Aggregate intrinsic value, Options exercisable	$ 0
Weighted average remaining contractual life, Options exercisable (in years)	1 year
Weighted average exercise price, Options exercisable (in dollars per share)	$ 32.80