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Financial Instruments and Risk Management - Interest Rate Risk (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Unrealized losses on derivatives | $ 14.2 | $ (10.3)
Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Reasonably possible change in risk variable, percentage | 1.00% |
Reasonably possible change in risk variable, impact on interest expense | $ 7.6 |
Reasonably possible change in risk variable, unhedged items, impact on interest expense | 4.1 |
Unrealized losses on derivatives | $ 4.4 |
Reasonable possible change in risk variable, unrealized loss, percentage | 0.25% |
Reasonably possible change in risk variable, impact on unrealized loss | $ 4.3 |
Prior credit facility |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings |  | 187.5
New Term Loans |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | 598.3 |
Unhedged borrowings | $ 248.3 |
New Term Loans | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedging instrument, term | 5 years |
Hedged item, liabilities | $ 350.0 |
Hedged item, subject to cancellation | 150.0 |
New Term Loans, November | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedged item, liabilities | 175.0 |
Hedged item, subject to cancellation | 75.0 |
New Term Loans, June | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedged item, liabilities | 175.0 |
Hedged item, subject to cancellation | 75.0 |
New Revolver |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | 159.0 |
Prior Revolving Facility |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings |  | $ 0.0
New credit facility |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | 757.3 |
Unhedged borrowings | 407.3 |
New credit facility | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Unhedged borrowings | $ 407.3 |

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