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Benefit Plans Benefit Plans - Allocation of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Special Situation Private Equity and Debt Funds [Member] | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 34.00% 25.00%  
Venture Private Equity Funds [Member] | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 23.00% 33.00%  
Buyout Private Equity Funds [Member] | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Actual 43.00% 42.00%  
U.S. Plans | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Acquired benefit plans and other $ 0.0 $ 0.0  
Actual 0.00%    
Actual   0.00%  
Fair value of plan assets $ 346.0 $ 378.7 $ 351.7
U.S. Plans | Pension Benefits | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 81.5 93.8  
U.S. Plans | Pension Benefits | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 216.5 237.7  
U.S. Plans | Pension Benefits | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 48.0 47.2  
U.S. Plans | Pension Benefits | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.0 3.5  
U.S. Plans | Pension Benefits | Cash and short-term investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.0 3.5  
U.S. Plans | Pension Benefits | Cash and short-term investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Cash and short-term investments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 26.8 32.0  
U.S. Plans | Pension Benefits | Mutual funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 26.8 32.0  
U.S. Plans | Pension Benefits | Mutual funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Mutual funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 45.6 50.0  
U.S. Plans | Pension Benefits | U.S. corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 45.6 50.0  
U.S. Plans | Pension Benefits | U.S. corporate bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International corporate bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.4 7.7  
U.S. Plans | Pension Benefits | U.S. government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.4 7.7  
U.S. Plans | Pension Benefits | U.S. government | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Fixed and index funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.1 0.6  
U.S. Plans | Pension Benefits | Fixed and index funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Fixed and index funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.1 0.6  
U.S. Plans | Pension Benefits | Fixed and index funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20.8 19.2  
U.S. Plans | Pension Benefits | Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20.8 19.2  
U.S. Plans | Pension Benefits | Other common collective trusts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 145.6 159.9  
U.S. Plans | Pension Benefits | Other common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Other common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 145.6 159.9  
U.S. Plans | Pension Benefits | Other common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19.3 18.9  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Multi-strategy hedge funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19.3 18.9  
U.S. Plans | Pension Benefits | Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.9 9.1  
U.S. Plans | Pension Benefits | Private equity funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Private equity funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Private equity funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.9 9.1  
U.S. Plans | Pension Benefits | Other Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Other Alternative Investments [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Other Alternative Investments [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Other Alternative Investments [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. mid cap value | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. mid cap value | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. mid cap value | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. small cap core      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.2 19.0  
U.S. Plans | Pension Benefits | U.S. small cap core | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.2 19.0  
U.S. Plans | Pension Benefits | U.S. small cap core | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | U.S. small cap core | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34.5 39.3  
U.S. Plans | Pension Benefits | International developed markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34.5 39.3  
U.S. Plans | Pension Benefits | International developed markets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | International developed markets | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.8 19.5  
U.S. Plans | Pension Benefits | Emerging markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. Plans | Pension Benefits | Emerging markets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.8 19.5  
U.S. Plans | Pension Benefits | Emerging markets | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 $ 0.0  
U.S. Plans | Equity securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actual 0.00%    
Actual 0.00% 0.00%  
U.S. Plans | Debt securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actual 0.00%    
Actual 0.00% 0.00%  
U.S. Plans | Real estate | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actual 0.00%    
Actual 0.00% 0.00%  
U.S. Plans | Other | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actual 0.00%    
Actual 0.00% 0.00%  
Foreign Plan [Member] | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Acquired benefit plans and other $ 2.5 $ 23.0  
Actual 0.00%    
Actual 0.00% 0.00%  
Fair value of plan assets $ 340.9 $ 359.5 $ 482.9
Foreign Plan [Member] | Pension Benefits | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 186.7 184.8  
Foreign Plan [Member] | Pension Benefits | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 82.4 92.9  
Foreign Plan [Member] | Pension Benefits | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 71.8 81.8  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34.0 82.5  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34.0 82.1  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.4  
Foreign Plan [Member] | Pension Benefits | Cash and short-term investments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 125.2 77.5  
Foreign Plan [Member] | Pension Benefits | Mutual funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 125.2 77.5  
Foreign Plan [Member] | Pension Benefits | Mutual funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Mutual funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. corporate bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | International corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 76.8 86.9  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.3 5.9  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 75.5 81.0  
Foreign Plan [Member] | Pension Benefits | International corporate bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. government | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14.7 11.7  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14.7 7.4  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 4.3  
Foreign Plan [Member] | Pension Benefits | Fixed and index funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.0 4.7  
Foreign Plan [Member] | Pension Benefits | Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.0 4.7  
Foreign Plan [Member] | Pension Benefits | Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Multi-strategy hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   1.6  
Foreign Plan [Member] | Pension Benefits | Multi-strategy hedge funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Multi-strategy hedge funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 1.6  
Foreign Plan [Member] | Pension Benefits | Multi-strategy hedge funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Private equity funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Private equity funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Private equity funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 73.7 82.7  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.9 0.9  
Foreign Plan [Member] | Pension Benefits | Other Alternative Investments [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 71.8 81.8  
Foreign Plan [Member] | Pension Benefits | U.S. mid cap value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.1 0.7  
Foreign Plan [Member] | Pension Benefits | U.S. mid cap value | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.1 0.7  
Foreign Plan [Member] | Pension Benefits | U.S. mid cap value | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. mid cap value | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. small cap core      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.3    
Foreign Plan [Member] | Pension Benefits | U.S. small cap core | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.3 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. small cap core | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | U.S. small cap core | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | International developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.7 11.2  
Foreign Plan [Member] | Pension Benefits | International developed markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.7 11.2  
Foreign Plan [Member] | Pension Benefits | International developed markets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | International developed markets | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.4    
Foreign Plan [Member] | Pension Benefits | Emerging markets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.4 0.0  
Foreign Plan [Member] | Pension Benefits | Emerging markets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign Plan [Member] | Pension Benefits | Emerging markets | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 $ 0.0  
Foreign Plan [Member] | Equity securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actual 0.00%    
Actual 0.00% 0.00%  
Foreign Plan [Member] | Debt securities | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actual 0.00%    
Actual 0.00% 0.00%  
Foreign Plan [Member] | Real estate | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actual 0.00%    
Actual 0.00% 0.00%  
Foreign Plan [Member] | Other | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actual 0.00%    
Actual 0.00% 0.00%