Employee Benefit Plans (Fair Value Hierarchy for Pension and Postretirement Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Level 3 [Member]
Fair value of plan assets	$ 1.5	$ 1.5	$ 1.8
Domestic Plan [Member] | Defined Benefit Pension Plans [Member]
Fair value of plan assets	63.1	51.4	408.3
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Total Equity Securities [Member]
Fair value of plan assets	19.1	15.7
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Domestic Equity [Member]
Fair value of plan assets	7.4	7.9
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | International Equity [Member]
Fair value of plan assets	9.7	6.3
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Emerging Markets [Member]
Fair value of plan assets	2.0	1.5
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets	44.0	35.6
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Corporate Bonds [Member]
Fair value of plan assets	31.8	25.7
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Government Securities [Member]
Fair value of plan assets	12.2	9.9
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Cash [Member]
Fair value of plan assets	0.0	0.1
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member]
Fair value of plan assets	0.0	0.1
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Total Equity Securities [Member]
Fair value of plan assets	0.0	0.0
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Domestic Equity [Member]
Fair value of plan assets	0.0	0.0
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | International Equity [Member]
Fair value of plan assets	0.0	0.0
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Emerging Markets [Member]
Fair value of plan assets	0.0	0.0
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets	0.0	0.0
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Corporate Bonds [Member]
Fair value of plan assets	0.0	0.0
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Government Securities [Member]
Fair value of plan assets	0.0	0.0
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Cash [Member]
Fair value of plan assets	0.0	0.1
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member]
Fair value of plan assets	63.1	51.3
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Total Equity Securities [Member]
Fair value of plan assets	19.1	15.7
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Domestic Equity [Member]
Fair value of plan assets	7.4	7.9
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | International Equity [Member]
Fair value of plan assets	9.7	6.3
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Emerging Markets [Member]
Fair value of plan assets	2.0	1.5
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets	44.0	35.6
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Corporate Bonds [Member]
Fair value of plan assets	31.8	25.7
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Government Securities [Member]
Fair value of plan assets	12.2	9.9
Domestic Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Cash [Member]
Fair value of plan assets	0.0	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member]
Fair value of plan assets	705.4	613.7	$ 576.3
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Total Equity Securities [Member]
Fair value of plan assets	125.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Domestic Equity [Member]
Fair value of plan assets	33.9
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | International Equity [Member]
Fair value of plan assets	91.1
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets	539.8
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Corporate Bonds [Member]
Fair value of plan assets	223.9
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Government Securities [Member]
Fair value of plan assets	236.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Other Fixed Income Securities [Member]
Fair value of plan assets	79.9
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Total Other Securities [Member]
Fair value of plan assets	40.6
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Cash [Member]
Fair value of plan assets	29.3
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Real Estate [Member]
Fair value of plan assets	0.9
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Other [Member]
Fair value of plan assets	0.6
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Derivatives [Member]
Fair value of plan assets	9.8
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member]
Fair value of plan assets	29.3
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Total Equity Securities [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Domestic Equity [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | International Equity [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Corporate Bonds [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Government Securities [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Other Fixed Income Securities [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Total Other Securities [Member]
Fair value of plan assets	29.3
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Cash [Member]
Fair value of plan assets	29.3
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Real Estate [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Other [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 1 [Member] | Derivatives [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member]
Fair value of plan assets	674.6
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Total Equity Securities [Member]
Fair value of plan assets	125.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Domestic Equity [Member]
Fair value of plan assets	33.9
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | International Equity [Member]
Fair value of plan assets	91.1
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets	539.8
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Corporate Bonds [Member]
Fair value of plan assets	223.9
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Government Securities [Member]
Fair value of plan assets	236.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Other Fixed Income Securities [Member]
Fair value of plan assets	79.9
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Total Other Securities [Member]
Fair value of plan assets	9.8
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Cash [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Real Estate [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Other [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 2 [Member] | Derivatives [Member]
Fair value of plan assets	9.8
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member]
Fair value of plan assets	1.5
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Total Equity Securities [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Domestic Equity [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | International Equity [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Corporate Bonds [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Government Securities [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Other Fixed Income Securities [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Total Other Securities [Member]
Fair value of plan assets	1.5
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Cash [Member]
Fair value of plan assets	0.0
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Real Estate [Member]
Fair value of plan assets	0.9
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Other [Member]
Fair value of plan assets	0.6
Foreign Plan [Member] | Defined Benefit Pension Plans [Member] | Level 3 [Member] | Derivatives [Member]
Fair value of plan assets	$ 0.0
Foreign Plan [Member] | Foreign Plan [Member]
Fair value of plan assets		613.7
Foreign Plan [Member] | Foreign Plan [Member] | Total Equity Securities [Member]
Fair value of plan assets		135.3
Foreign Plan [Member] | Foreign Plan [Member] | Domestic Equity [Member]
Fair value of plan assets		27.7
Foreign Plan [Member] | Foreign Plan [Member] | International Equity [Member]
Fair value of plan assets		107.6
Foreign Plan [Member] | Foreign Plan [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets		419.6
Foreign Plan [Member] | Foreign Plan [Member] | Corporate Bonds [Member]
Fair value of plan assets		194.8
Foreign Plan [Member] | Foreign Plan [Member] | Government Securities [Member]
Fair value of plan assets		192.8
Foreign Plan [Member] | Foreign Plan [Member] | Other Fixed Income Securities [Member]
Fair value of plan assets		32.0
Foreign Plan [Member] | Foreign Plan [Member] | Total Other Securities [Member]
Fair value of plan assets		58.8
Foreign Plan [Member] | Foreign Plan [Member] | Cash [Member]
Fair value of plan assets		23.2
Foreign Plan [Member] | Foreign Plan [Member] | Real Estate [Member]
Fair value of plan assets		0.9
Foreign Plan [Member] | Foreign Plan [Member] | Other [Member]
Fair value of plan assets		0.6
Foreign Plan [Member] | Foreign Plan [Member] | Derivatives [Member]
Fair value of plan assets		34.1
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member]
Fair value of plan assets		23.2
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Total Equity Securities [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Domestic Equity [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | International Equity [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Corporate Bonds [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Government Securities [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Other Fixed Income Securities [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Total Other Securities [Member]
Fair value of plan assets		23.2
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Cash [Member]
Fair value of plan assets		23.2
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Real Estate [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Other [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 1 [Member] | Derivatives [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member]
Fair value of plan assets		589.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Total Equity Securities [Member]
Fair value of plan assets		135.3
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Domestic Equity [Member]
Fair value of plan assets		27.7
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | International Equity [Member]
Fair value of plan assets		107.6
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets		419.6
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Corporate Bonds [Member]
Fair value of plan assets		194.8
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Government Securities [Member]
Fair value of plan assets		192.8
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Other Fixed Income Securities [Member]
Fair value of plan assets		32.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Total Other Securities [Member]
Fair value of plan assets		34.1
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Cash [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Real Estate [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Other [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 2 [Member] | Derivatives [Member]
Fair value of plan assets		34.1
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member]
Fair value of plan assets		1.5
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Total Equity Securities [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Domestic Equity [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | International Equity [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Total Fixed Income Securities [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Corporate Bonds [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Government Securities [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Other Fixed Income Securities [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Total Other Securities [Member]
Fair value of plan assets		1.5
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Cash [Member]
Fair value of plan assets		0.0
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Real Estate [Member]
Fair value of plan assets		0.9
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Other [Member]
Fair value of plan assets		0.6
Foreign Plan [Member] | Foreign Plan [Member] | Level 3 [Member] | Derivatives [Member]
Fair value of plan assets		$ 0.0