Pension Plans and Other Postretirement Benefits (Details 12) - Pension Benefits [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		$ 2,204.4		$ 2,329.8
Net Realized and Unrealized Gains (Losses)		(41.1)		136.8
Fair value of plan assets at end of year		1,962.3		2,204.4
Fixed income and cash equivalents [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	[1]	383.5
Fair value of plan assets at end of year		369.7	[2]	383.5	[1]
Floating rate [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	[1]	392.3
Fair value of plan assets at end of year		358.0	[2]	392.3	[1]
Private equity [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		172.6
Fair value of plan assets at end of year		201.2		172.6
Hedge funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		84.7
Fair value of plan assets at end of year		51.9		84.7
Real estate and other [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		156.6
Fair value of plan assets at end of year		186.5		156.6
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		809.7		655.3
Net Realized and Unrealized Gains (Losses)		43.5		43.4
Net Purchases, Issuances and Settlements		(53.0)		111.0
Net Transfers Into (Out Of) Level 3		0.0		0.0
Fair value of plan assets at end of year		800.2		809.7
Significant Unobservable Inputs (Level 3) [Member] | Fixed income and cash equivalents [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		8.9	[1]	0.8
Net Realized and Unrealized Gains (Losses)		0.0		0.1
Net Purchases, Issuances and Settlements		(0.4)		8.0
Net Transfers Into (Out Of) Level 3		0.0		0.0
Fair value of plan assets at end of year		8.5	[2]	8.9	[1]
Significant Unobservable Inputs (Level 3) [Member] | Floating rate [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		392.3	[1]	294.5
Net Realized and Unrealized Gains (Losses)		6.8		4.6
Net Purchases, Issuances and Settlements		(41.1)		93.2
Net Transfers Into (Out Of) Level 3		0.0		0.0
Fair value of plan assets at end of year		358.0	[2]	392.3	[1]
Significant Unobservable Inputs (Level 3) [Member] | Private equity [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		172.6		123.0
Net Realized and Unrealized Gains (Losses)		11.7		20.5
Net Purchases, Issuances and Settlements		16.9		29.1
Net Transfers Into (Out Of) Level 3		0.0		0.0
Fair value of plan assets at end of year		201.2		172.6
Significant Unobservable Inputs (Level 3) [Member] | Hedge funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		84.7		111.2
Net Realized and Unrealized Gains (Losses)		2.5		4.5
Net Purchases, Issuances and Settlements		(35.3)		(31.0)
Net Transfers Into (Out Of) Level 3		0.0		0.0
Fair value of plan assets at end of year		51.9		84.7
Significant Unobservable Inputs (Level 3) [Member] | Real estate and other [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		151.2		125.8
Net Realized and Unrealized Gains (Losses)		22.5		13.7
Net Purchases, Issuances and Settlements		6.9		11.7
Net Transfers Into (Out Of) Level 3		0.0		0.0
Fair value of plan assets at end of year		$ 180.6		$ 151.2

[1] Global debt securities include both fixed interest rate and floating interest rate instruments. These are comprised of actively managed investments which include U.S. government and U.S. government agency securities, foreign government securities, corporate bonds, mortgage-backed securities and other debt securities, and include both investment grade and non-investment grade debt, public and private debt, and secured and unsecured debt investments. To mitigate risk, investment managers have limitations regarding the amount of investment in particular securities and the credit quality of such investments.

[2] Global debt securities include both fixed interest rate and floating interest rate instruments. These are comprised of actively managed investments which include U.S. government and U.S. government agency securities, foreign government securities, corporate bonds, mortgage-backed securities and other debt securities, and include both investment grade and non-investment grade debt, public and private debt, and secured and unsecured debt investments. To mitigate risk, investment managers have limitations regarding the amount of investment in particular securities and the credit quality of such investments.