Retirement Plans and Post Retirement Benefits Asset Allocation and Fair Value of Plan Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$ 274.8		$ 265.9		$ 239.9
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		101.5		147.5
Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		160.6		105.5
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		12.7		12.9
Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	22.3		56.2
Domestic stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	22.3		42.2
Domestic stock funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	0.0		14.0
Domestic stock funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	0.0		0.0
International stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	13.2		43.1
International stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	13.2		15.5
International stock funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	0.0		27.6
International stock funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	0.0		0.0
Domestic bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		27.1	[2]	40.2	[1]
Domestic bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	27.1		20.2
Domestic bond funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	0.0		20.0
Domestic bond funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	0.0		0.0
International bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[2]	27.3		40.9
International bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]			0.0
International bond funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	27.3		40.9
International bond funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]			0.0
Multi-strategy Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		35.0		82.5	[3]
Multi-strategy Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		35.0		69.6	[3]
Multi-strategy Funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0		0.0	[3]
Multi-strategy Funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0		12.9	[3]
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		1.5		3.0
Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0		0.0
Cash and Cash Equivalents | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		1.5		3.0
Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$ 0.0		$ 0.0
UNITED STATES
Target Allocations [Abstract]
Target Plan Asset Allocation 2018		100.00%
Defined Benefit Plan, Actual Plan Asset Allocation		100.00%		100.00%
UNITED STATES | Equity Securities
Target Allocations [Abstract]
Target Plan Asset Allocation 2018		33.00%
Defined Benefit Plan, Actual Plan Asset Allocation		26.00%		40.00%
UNITED STATES | Debt Securities
Target Allocations [Abstract]
Target Plan Asset Allocation 2018		50.00%
Defined Benefit Plan, Actual Plan Asset Allocation		52.00%		20.00%
UNITED STATES | Multi-strategy Funds
Target Allocations [Abstract]
Target Plan Asset Allocation 2018		17.00%
Defined Benefit Plan, Actual Plan Asset Allocation		22.00%		40.00%
Non-US [Member]
Target Allocations [Abstract]
Target Plan Asset Allocation 2018		100.00%
Defined Benefit Plan, Actual Plan Asset Allocation		100.00%		100.00%
Non-US [Member] | Equity Securities
Target Allocations [Abstract]
Target Plan Asset Allocation 2018		0.00%
Defined Benefit Plan, Actual Plan Asset Allocation		0.00%		28.00%
Non-US [Member] | Debt Securities
Target Allocations [Abstract]
Target Plan Asset Allocation 2018		90.00%
Defined Benefit Plan, Actual Plan Asset Allocation		90.00%		70.00%
Non-US [Member] | Cash and Cash Equivalents
Target Allocations [Abstract]
Target Plan Asset Allocation 2018		10.00%
Defined Benefit Plan, Actual Plan Asset Allocation		10.00%		2.00%
Net Asset Value, previously Level 1 [Member] [Member] | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	$ 0.0
Net Asset Value, previously Level 1 [Member] [Member] | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]
Net Asset Value, previously Level 1 [Member] [Member] | Domestic bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		3.9
Net Asset Value, previously Level 1 [Member] [Member] | International bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0
Net Asset Value, previously Level 1 [Member] [Member] | Multi-strategy Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	0.0
Net Asset Value, previously Level 2 [Member] | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	8.3
Net Asset Value, previously Level 2 [Member] | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	13.7
Net Asset Value, previously Level 2 [Member] | Domestic bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		84.6
Net Asset Value, previously Level 2 [Member] | International bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		20.1
Net Asset Value, previously Level 2 [Member] | Multi-strategy Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	5.1
Net Asset Value, previously Level 3 [Member] | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	0.0
Net Asset Value, previously Level 3 [Member] | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]
Net Asset Value, previously Level 3 [Member] | Domestic bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets
Net Asset Value, previously Level 3 [Member] | International bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0
Net Asset Value, previously Level 3 [Member] | Multi-strategy Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		12.7	[1]	$ 12.9		$ 12.2
Net Asset Value [Member] | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	8.3
Net Asset Value [Member] | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	13.7
Net Asset Value [Member] | Domestic bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	88.5
Net Asset Value [Member] | International bond funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	20.1
Net Asset Value [Member] | Multi-strategy Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[2]	$ 17.8

[1] Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.

[2] Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.

[3] The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.