Employee Benefits (Fair Value) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of private equity funds investing in renewable solar energy	5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	$ 899.3		$ 808.4		$ 799.4
Fixed Income Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of Fixed Income Funds Investing in Debt Securities Secured by Royalty Payments			3
Fair Value, Measurements, Recurring [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	899.3		808.4
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	241.6		255.2
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	422.9		381.5
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension assets at fair value	197.8		171.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Purchases	37.8		16.0
Sales	(5.3)		(11.7)
Unrealized gain (loss)	30.6		32.5
Fair value of plan assets at year end	234.8		171.7		134.9
Fair Value, Measurements, Recurring [Member] | Equities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	224.1		219.7
Fair Value, Measurements, Recurring [Member] | Equities [Member] | Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	112.2		113.3
Fair Value, Measurements, Recurring [Member] | Equities [Member] | Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	111.9		106.4
Fair Value, Measurements, Recurring [Member] | Equities [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		0
Fair Value, Measurements, Recurring [Member] | Private equities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	104.7		60.3
Fair Value, Measurements, Recurring [Member] | Private equities [Member] | Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		0
Fair Value, Measurements, Recurring [Member] | Private equities [Member] | Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		0
Fair Value, Measurements, Recurring [Member] | Private equities [Member] | Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension assets at fair value	67.7	[1]	60.3	[2]
Unfunded Commitments	18.2	[1]	18.0	[2]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Purchases	32.8		6.4
Sales	(1.0)		(6.4)
Unrealized gain (loss)	12.6		21.5
Fair value of plan assets at year end	104.7		60.3		38.8
Fair Value, Measurements, Recurring [Member] | Corporate [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	171.0		149.4
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	7.9		4.3
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	33.0		33.7
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	130.1		111.4
Fair Value, Measurements, Recurring [Member] | Government [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	264.3		200.8
Fair Value, Measurements, Recurring [Member] | Government [Member] | Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	106.9		98.0
Fair Value, Measurements, Recurring [Member] | Government [Member] | Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	157.4		102.8
Fair Value, Measurements, Recurring [Member] | Government [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		0
Fair Value, Measurements, Recurring [Member] | Other Fixed Income Investments [Domain]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		10.1
Fair Value, Measurements, Recurring [Member] | Other Fixed Income Investments [Domain] | Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		10.1
Fair Value, Measurements, Recurring [Member] | Other Fixed Income Investments [Domain] | Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		0
Fair Value, Measurements, Recurring [Member] | Other Fixed Income Investments [Domain] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		0
Fair Value, Measurements, Recurring [Member] | Absolute Return [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	120.6		144.8
Fair Value, Measurements, Recurring [Member] | Absolute Return [Member] | Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		6.2
Fair Value, Measurements, Recurring [Member] | Absolute Return [Member] | Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	120.6		138.6
Fair Value, Measurements, Recurring [Member] | Absolute Return [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		0
Fair Value, Measurements, Recurring [Member] | Interest bearing [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	14.6		23.3
Fair Value, Measurements, Recurring [Member] | Interest bearing [Member] | Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	14.6		23.3
Fair Value, Measurements, Recurring [Member] | Interest bearing [Member] | Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		0
Fair Value, Measurements, Recurring [Member] | Interest bearing [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at year end	0		0
Fair Value, Measurements, Recurring [Member] | Fixed income [Member] | Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension assets at fair value	130.1	[3]	111.4	[4]
Unfunded Commitments	12.6	[3]	16.0	[4]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Purchases	5.0		9.6
Sales	(4.3)		(5.3)
Unrealized gain (loss)	18.0		11.0
Fair value of plan assets at year end	$ 130.1		$ 111.4		$ 96.1
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Redemption notice period for assets with fair value estimated using NAV per share	1 day
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Redemption notice period for assets with fair value estimated using NAV per share	90 days

[1] Consists of private equity investments in renewable energy, healthcare and Chinese technology.

[2] Consists of five private equity funds investing in renewable solar energy, acquisition of pharmaceutical company interests, Chinese technology and healthcare companies.

[3] Primarily consists of investments in and debt securities secured by royalty payments from marketers of pharmaceuticals.

[4] Consists of three fixed income funds which invest in debt securities secured by royalty payments from marketers of pharmaceutical products.